tetrahydroisochinoliny [Tetrahydroisoquinolines]

tematický
43
Termíny

1,2,3,4-Tetrahydroisoquinolines
Tetrahydro-Isoquinoline
Tetrahydro-Isoquinolines

Perzistentní odkaz   https://www.medvik.cz/link/D044005
Definice

A group of ISOQUINOLINES in which the nitrogen containing ring is protonated. They derive from the non-enzymatic Pictet-Spengler condensation of CATECHOLAMINES with ALDEHYDES.

DUI
D044005 MeSH Prohlížeč
CUI
M0444141
CAS
Isoquinolines, 1,2,3,4-tetrahydro-
Předchozí užití
Isoquinolines (1969-2003)
Historická pozn.
2004
Veřejná pozn.
2004

D Chemikálie a léčiva
D03.633.100.531 isochinoliny 191
D03.633.100.531.085 benzylisochinoliny 6
D03.633.100.531.205 debrisochin 2
D03.633.100.531.321 emetin 28
D03.633.100.531.430 mivakurium 1
D03.633.100.531.460 naftalimidy 1
D03.633.100.531.520 nelfinavir 8
D03.633.100.531.535 nomifensin 2
D03.633.100.531.567 noskapin 1
D03.633.100.531.629 palonosetron 14
D03.633.100.531.690 praziquantel 35
D03.633.100.531.770 saquinavir 3
D03.633.100.531.820 tetrahydroisochinoliny 43
D03.633.100.531.820.250 quinapril 1
D03.633.100.531.820.500 salsolinové alkaloidy 1
D03.633.100.531.820.594 solifenacin sukcinát 16
D03.633.100.531.820.687 toxiferin 2
D03.633.100.531.820.781 trabektedin 1
D03.633.100.531.820.875 tubokurarin 24
D09 sacharidy 724
D10 lipidy 2 528

(1,2,3,4-tetrahydro-isoquinolin-1-yl)acetic acid Chemical MeSH Prohlížeč

(1R)-(4-hydroxybenzyl)-7-hydroxyl-8-O-beta-D-glucopyranosyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

(4S)-N-methyl-4-phenyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

(R)-1-(1H-indol-3-yl)-2-phenylmethanesulfonyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

(R)-PFI-2 Chemical MeSH Prohlížeč

(S)-2-(2,4-hexadienoyl)-7-(2-(5-methyl-2-phenyloxazol-4-yl)ethoxy)-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid Chemical MeSH Prohlížeč

1'-heptamethylene-bis-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1,1'-(propane-1,3-diyl)-bis-(6,7-dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinoline) Chemical MeSH Prohlížeč

1,1-dimethyl-6-methoxy-7-hydroxyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1,1-pentamethylenetetrahydroisoquinoline Chemical MeSH Prohlížeč

1,2,3,4 tetrahydro-2-(3-mercapto-1-oxopropyl)-1-isoquinolinecarboxylic acid Chemical MeSH Prohlížeč

1,2,3,4-tetrahydro-1,1,2,3,3,4,4-heptamethyl-6,7-dimethoxyisoquinoline Chemical MeSH Prohlížeč

1,2,3,4-tetrahydro-1-(phenylmethyl)isoquinoline Chemical MeSH Prohlížeč

1,2,3,4-tetrahydro-1-phenylisoquinoline Chemical MeSH Prohlížeč

1,2,3,4-tetrahydro-4,4-dimethylisoquinoline Chemical MeSH Prohlížeč

1,2,3,4-tetrahydro-7-hydroxy-8-iodoisoquinoline-3-carboxylic acid Chemical MeSH Prohlížeč

1,2,3,4-tetrahydro-7-methoxyisoquinoline-3-carboxylic acid Chemical MeSH Prohlížeč

1,2,3,4-tetrahydro-N-methyl-1-phenylisoquinoline Chemical MeSH Prohlížeč

1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1,2,3,4-tetrahydroisoquinoline carboxylic acid Chemical MeSH Prohlížeč

1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid Chemical MeSH Prohlížeč

1,2-dimethyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1,3-dimethyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1-(1-adamantyl)-2-(4-(2-chloropyrimidinyl))-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1-(2,3,4,5-tetrahydro-5-oxo-2-furyl)-2-N-(p-toluenesulfonyl)-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1-(2-methyl-3-hydroxy-5-hydroxymethyl-4-pyridyl)-6,7-dihydroxy-1,2-3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1-(3'-hydroxyphenyl)-6,7-dimethoxy-N-methyltetrahydroisoquinoline Chemical MeSH Prohlížeč

1-(3-fluoro-4-(trifluoromethyl)phenyl)-N-(1,1,1-trifluoropropan-2-yl)-3,4-dihydroisoquinoline-2(1H)-carboxamide Chemical MeSH Prohlížeč

1-(beta-naphthylmethyl)-6,7-dihydroxy-1,2,3,4-tetra-hydroisoquinoline Chemical MeSH Prohlížeč

1-(pyrrolidin-1-ylmethyl)-2-((6-chloro-3-oxoindan)formyl)-7-hydroxy-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1-acetyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1-cyclopropyl-6-hydroxy-8-methyl-4-oxo-7-(1,2,3,4-tetrahydro-2-isoquinolyl)-1,4-dihydroquinoline-3-carboxylic acid Chemical MeSH Prohlížeč

1-methyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1-methyl-1-phenyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1-naphthylethyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1-oxo-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

1-phenyl-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

10-O-demethylcephaeline Chemical MeSH Prohlížeč

13-epi-yenhusomine Chemical MeSH Prohlížeč

2',6'-dimethyltyrosyl--1,2,3,4-tetrahydro-3-isoquinolinecarbonyl-psi(CH2MH)-phenylalanyl-phenylalaninamide Chemical MeSH Prohlížeč

2',6'-dimethyltyrosyl-1,2,3,4-tetrahydro-3-isoquinolinecarbonyl-alanine 1-adamantane amide Chemical MeSH Prohlížeč

2',6'-dimethyltyrosyl-1,2,3,4-tetrahydro-3-isoquinolinecarbonyl-phenylalanyl-phenylalaninamide Chemical MeSH Prohlížeč

2',6'-dimethyltyrosyl-1,2,3,4-tetrahydroisoquinoline-3-carbonyl-alanyl tert-butyl amide Chemical MeSH Prohlížeč

2',6'-dimethyltyrosyl-1,2,3,4-tetrahydroisoquinoline-3-carbonyl-glycine N-benzylamide Chemical MeSH Prohlížeč

2',6'-dimethyltyrosyl-1,2,3,4-tetrahydroisoquinoline-3-carbonylamino-1-adamantane Chemical MeSH Prohlížeč

2',6'-dimethyltyrosyl-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid Chemical MeSH Prohlížeč

2-(5-bromo-2,3-dimethoxyphenyl)-4-(6,7-dimethoxy-1,2,3,4-tetrahydroisoquinolinomethyl)imidazole Chemical MeSH Prohlížeč

2-(biphenyl-4-ylsulfonyl)-1,2,3,4-tetrahydroisoquinolin-3-carboxylic acid Chemical MeSH Prohlížeč

2-acetyl-1-(4'-chlorophenyl)-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

2-acetyl-1-ethyl-7-hydroxy-6-methoxy-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

2-amino-1,2,3,4-tetrahydroisoquinoline-1,3-dione Chemical MeSH Prohlížeč

2-methoxy-4-(7-methoxy-1,2,3,4-tetrahydroisoquinolin-1-yl)phenol Chemical MeSH Prohlížeč

2-methyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

2-methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

2-naphthylethyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

2-tyrosyl-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid Chemical MeSH Prohlížeč

3,4-methano-1,2,3,4,-tetrahydroisoquinoline-3-carboxylic acid Chemical MeSH Prohlížeč

3-carboxy-5-phosphono-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

3-chloromethyl-7-nitro-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

3-epi-jorumycin Chemical MeSH Prohlížeč

3-epi-renieramycin G Chemical MeSH Prohlížeč

3-fluoromethyl-7-cyano-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

3-methyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

3-methyl-N-propargyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

3-trifluoromethyl-7-bromo-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

3-trifluoromethyl-7-nitro-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

4'-(6,7-dimethoxy-3,4-dihydro-1H-isoquinolin-2-ylmethyl)biphenyl-4-ol Chemical MeSH Prohlížeč

4,4-diphenyl-3-oxo-6-sulfamyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

4-((2-amidino-1,2,3,4-tetrahydroisoquinolin-7-yloxy)methyl)-1-(4-pyridinyl)piperidine-4-carboxylic acid monomethanesulfonate trihydrate Chemical MeSH Prohlížeč

4-(3,4-dihydroxyphenyl)-7-hydroxy-8-methyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

4-(4-bromophenyl)-2-methyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

4-amino-2-cyano-1,3-dimethoxy-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

4-phenyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

458L Chemical MeSH Prohlížeč

5,6,7,8-tetrahydro-1,3-dioxolo(4,5-g)isoquinoline Chemical MeSH Prohlížeč

5,6-dimethoxy-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

6,7-dihydroxy-N-cyanomethyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid Chemical MeSH Prohlížeč

6,7-dimethoxy-2-(4-methoxybiphenyl-4-yl-methyl)-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

6,7-dimethoxy-2-(6-methoxynaphthalen-2-ylmethyl)-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

6,7-dimethoxytetrahydroisoquinoline Chemical MeSH Prohlížeč

7',10-dide-O-methylcephaeline Chemical MeSH Prohlížeč

7,8-dichloro-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

7-aminosulfonyl-3-hydroxymethyl-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

7-hydroxy-N-(1-((4-(3-hydroxyphenyl)-3,4-dimethyl-1--piperidinyl)methyl)-2-methylpropyl)-1,2,3,4-tetrahydro-2-methylisoquinolinecarboxamide Chemical MeSH Prohlížeč

7-hydroxy-N-(1-((4-(3-hydroxyphenyl)-3,4-dimethyl-1-piperidinyl)methyl)-2-methylpropyl)-1,2,3,4-tetrahydro-3-isoquinolinecarboxamide Chemical MeSH Prohlížeč

7-hydroxy-N-(1-((4-(3-hydroxyphenyl)-3,4-dimethylpiperidin-1-yl)methyl)-2-methylbutyl)-1,2,3,4-tetrahydroisoquinoline-3-carboxamide dihydrochloride Chemical MeSH Prohlížeč

7-isothiocyanatotetrahydroisoquinoline Chemical MeSH Prohlížeč

8-(4-(2-(1,2,3,4-tetrahydroisoquinolinyl))butyl)-8-azaspiro(4.5)decane-7,9-dione Chemical MeSH Prohlížeč

8-chloro-tetrahydroisoquinoline-7-sulfonamide Chemical MeSH Prohlížeč

AG525E1 Chemical MeSH Prohlížeč

AIS 48 Chemical MeSH Prohlížeč

AR-R 18512 Chemical MeSH Prohlížeč

ARRI 7338 Chemical MeSH Prohlížeč

BW 737C89 Chemical MeSH Prohlížeč

CGS 26529 Chemical MeSH Prohlížeč

CH 141 Chemical MeSH Prohlížeč

CPU 23 Chemical MeSH Prohlížeč

CPU 57 Chemical MeSH Prohlížeč

CSH 118 Chemical MeSH Prohlížeč

DL-N-(2-quinuclidinoyl)-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

DL-N-(2-quinuclidinylmethyl)-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

EDL-155 Chemical MeSH Prohlížeč

EU 4865 Chemical MeSH Prohlížeč

Elacridar Chemical MeSH Prohlížeč

GS 389 Chemical MeSH Prohlížeč

HOE 140, desArg(10)- Chemical MeSH Prohlížeč

JNJ-28583867 Chemical MeSH Prohlížeč

KV-5070 Chemical MeSH Prohlížeč

MS 857 Chemical MeSH Prohlížeč

MY 336-a Chemical MeSH Prohlížeč

N,N'-bis-(2-carbamoyl-1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinolinyl)piperazine Chemical MeSH Prohlížeč

N,N(Me)2-dimethyl-tyrosine-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid-OH Chemical MeSH Prohlížeč

N,N-diethyl-2',6'-dimethyltyrosyl-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid Chemical MeSH Prohlížeč

N,N-dimethyl-2',6'-dimethyltyrosyl-1,2,3,4-tetrahydro-3-isoquinolinecarbonyl 1-adamantane amide Chemical MeSH Prohlížeč

N,N-dimethyl-2',6'-dimethyltyrosyl-1,2,3,4-tetrahydro-3-isoquinolinecarboxylic acid Chemical MeSH Prohlížeč

N,N-dimethyl-2',6'-dimethyltyrosyl-1,2,3,4-tetrahydroisoquinoline-3-carbonyl tert-butyl amide Chemical MeSH Prohlížeč

N-((2-(N-(2-amino-3-mercaptopropyl)-3-methylvalyl)-1,2,3,4-tetrahydro-3-isoquinolinyl)carbonyl)glutamine Chemical MeSH Prohlížeč

N-(1,2,3,4-tetrahydroisoquinolinium-3-ylcarbonyl)-1-(4-chlorobenzyl)-2-(4-cyclohexyl-4-(1H-1,2,4-triazol-1-ylmethyl)piperidin-1-yl)-2-oxoethylamine Chemical MeSH Prohlížeč

N-(1-((4-(3-carbamoylphenyl)-3,4-dimethylpiperidin-1-yl)methyl)-2-methylpropyl)-7-hydroxy-1,2,3,4-tetrahydroisoquinoline-3-carboxamide Chemical MeSH Prohlížeč

N-(1-((4-(3-hydroxyphenyl)-3,4-dimethylpiperidin-1-yl)methyl)-2-methylpropyl)-7-methoxy-1,2,3,4-tetrahydroisoquinoline-3-carboxamide Chemical MeSH Prohlížeč

N-(2-(3-(6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline-2-carbonyl)piperidinio)ethyl)-4-fluorobenzamide Chemical MeSH Prohlížeč

N-(2-bromo-4-methylphenyl)-1,2,3,4-tetrahydroisoquinoline-1,3-dione Chemical MeSH Prohlížeč

N-(2-chlorobenzyl)-1,2,3,4-tetrahydroisoquinoline-1,3-dione Chemical MeSH Prohlížeč

N-(2-dichlorophenyl)-1,2,3,4-tetrahydroisoquinoline-1,3-dione Chemical MeSH Prohlížeč

N-hydroxy-2-((2,2,2-trifluoroethoxy)(4-methoxyphenyl)phosphoryl)-1,2,3,4-tetrahydroisoquinoline-3-carboxamide Chemical MeSH Prohlížeč

N-hydroxy-2-((2,2-difluoroethoxy)(4-methoxyphenyl)phosphoryl)-1,2,3,4-tetrahydroisoquinoline-3-carboxamide Chemical MeSH Prohlížeč

N-methylcoculaurine Chemical MeSH Prohlížeč

N-phenyltetrahydroisoquinoline Chemical MeSH Prohlížeč

NS-417 cpd Chemical MeSH Prohlížeč

P91024 Chemical MeSH Prohlížeč

PFR(Tic)amide Chemical MeSH Prohlížeč

PM 00104 Chemical MeSH Prohlížeč

RESPIR 4-95 Chemical MeSH Prohlížeč

RP 44081 Chemical MeSH Prohlížeč

RS 42358-197 Chemical MeSH Prohlížeč

RS 93007 Chemical MeSH Prohlížeč

SB 277011 Chemical MeSH Prohlížeč

SPD 502 Chemical MeSH Prohlížeč

TCV 309 Chemical MeSH Prohlížeč

TSL 225 Chemical MeSH Prohlížeč

Tic(5) didemnin B Chemical MeSH Prohlížeč

XR 9051 Chemical MeSH Prohlížeč

YH 1885 Chemical MeSH Prohlížeč

YS 49 Chemical MeSH Prohlížeč

abanoquil Chemical MeSH Prohlížeč

alangiside Chemical MeSH Prohlížeč

ancistrocladine Chemical MeSH Prohlížeč

argemonine Chemical MeSH Prohlížeč

beta-methyl-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid Chemical MeSH Prohlížeč

bisobrin Chemical MeSH Prohlížeč

carnegine Chemical MeSH Prohlížeč

cyclo(2',6'-dimethyltyrosyl-1,2,3,4-tetrahydroisoquinoline-3-carbonyl) Chemical MeSH Prohlížeč

dauricine Chemical MeSH Prohlížeč

dynorphin A, Dmt(1)-Tic(2)- Chemical MeSH Prohlížeč

gastrofenzin Chemical MeSH Prohlížeč

heliamine Chemical MeSH Prohlížeč

higenamine Chemical MeSH Prohlížeč

hyalachelin A Chemical MeSH Prohlížeč

hyalachelin B Chemical MeSH Prohlížeč

hyalachelin C Chemical MeSH Prohlížeč

hydrastinine Chemical MeSH Prohlížeč

hydrocotarnine Chemical MeSH Prohlížeč

isocephaeline Chemical MeSH Prohlížeč

jorumycin Chemical MeSH Prohlížeč

l-alpha-methyl-8-methoxy-6,7-dihydroxy-1-(6,7-dimethoxy-3-phthalidyl)-1,2,3,4-tetrahydroisoquinoline Chemical MeSH Prohlížeč

lemonomycin Chemical MeSH Prohlížeč

lemonomycinone Chemical MeSH Prohlížeč

lophophorine Chemical MeSH Prohlížeč

methyl N-((2-(N-(2-amino-3-mercaptopropyl)-3-methylvalyl)-1,2,3,4-tetrahydro-3-isoquinolinyl)carbonyl)methionine Chemical MeSH Prohlížeč

methyl-2',6'-dimethyltyrosinyltetrahydroisoquinoline-3-carboxylic acid Chemical MeSH Prohlížeč

moexipril Chemical MeSH Prohlížeč

moexiprilat Chemical MeSH Prohlížeč

oceanalin A Chemical MeSH Prohlížeč

oxyhydrastinine Chemical MeSH Prohlížeč

phenylazo-1,2,3,4-tetrahydro-3-isoquinolinecarboxylic acid Chemical MeSH Prohlížeč

quinaprilat Chemical MeSH Prohlížeč

renieramycin G Chemical MeSH Prohlížeč

renieramycin I Chemical MeSH Prohlížeč

renieramycin J Chemical MeSH Prohlížeč

renieramycin M Chemical MeSH Prohlížeč

renieramycin N Chemical MeSH Prohlížeč

renieramycin O Chemical MeSH Prohlížeč

renieramycin T Chemical MeSH Prohlížeč

soquinolol Chemical MeSH Prohlížeč

toquipidine Chemical MeSH Prohlížeč

trequinsin Chemical MeSH Prohlížeč

tylocrebrine Chemical MeSH Prohlížeč

tyrosyl 1,2,3,4-tetrahydro-3-isoquinolinecarbonyl-phenylalanine Chemical MeSH Prohlížeč

tyrosyl--1,2,3,4--tetrahydroisoquinoline-3-carbonyl-phenylalanyl-4-isothiocyanatophenylalanine Chemical MeSH Prohlížeč

tyrosyl--1,2,3,4-tetrahydroisoquinoline-3-carbonyl-4-isothiocyanatophenylalanyl-phenylalanine Chemical MeSH Prohlížeč

tyrosyl-1,2,3,4--tetrahydroisoquinoline-3-carboxamide Chemical MeSH Prohlížeč

tyrosyl-1,2,3,4-tetrahydro--3--isoquinolinecarbonyl-psi(CH2-NH)-cyclohexylalanyl-phenylalanine Chemical MeSH Prohlížeč

tyrosyl-1,2,3,4-tetrahydro--3-isoquinolinecarbonyl-phenylalanyl-phenylalaninamide Chemical MeSH Prohlížeč

tyrosyl-1,2,3,4-tetrahydro-3--isoquinoline-carbonyl-alanine Chemical MeSH Prohlížeč

tyrosyl-1,2,3,4-tetrahydro-3-isoquinolinecarbonyl-phenylalanyl-phenylalanine Chemical MeSH Prohlížeč

tyrosyl-1,2,3,4-tetrahydroisoquinoline-3-carbonyl-phenylalanyl-4-bromoacetamidophenylalanine Chemical MeSH Prohlížeč

veronamine Chemical MeSH Prohlížeč

zelandopam Chemical MeSH Prohlížeč