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You can:

Check the GPCR table for details.
Go to the ligand list to see ligands that interacts with this GPCR.
Go to the individual ligand page for PubMed ID information by text mining.
Download a TSV version of all interaction data.
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GPCR

Name	Muscarinic acetylcholine receptor M2
Species	Mus musculus (Mouse)
Gene	Chrm2
Synonym	cholinergic receptor cholinergic receptor, muscarinic 2 AChR M2 Chrm-2 M2 muscarinic acetylcholine receptor M2 receptor cholinergic receptor, muscarinic 2, cardiac [ Show all ]
Disease	N/A for non-human GPCRs
Length	466
Amino acid sequence	MNNSTNSSNNGLAITSPYKTFEVVFIVLVAGSLSLVTIIGNILVMVSIKVNRHLQTVNNYFLFSLACADLIIGVFSMNLYTLYTVIGYWPLGPVVCDLWLALDYVVSNASVMNLLIISFDRYFCVTKPLTYPVKRTTKMAGMMIAAAWVLSFILWAPAILFWQFIVGVRTVEDGECYIQFFSNAAVTFGTAIAAFYLPVIIMTVLYWHISRASKSRIKKEKKEPVANQDPVSPSLVQGRIVKPNNNNMPGGDGGLEHNKIQNGKAPRDGGTENCVQGEEKESSNDSTSVSAVASNMRDDEITQDENTVSTSLGHSKDDNSRQTCIKIVTKTQKGDACTPTSTTVELVGSSGQNGDEKQNIVARKIVKMTKQPAKKKPPPSREKKVTRTILAILLAFIITWAPYNVMVLINTFCAPCIPNTVWTIGYWLCYINSTINPACYALCNATFKKTFKHLLMCHYKNIGATR
UniProt	Q9ERZ4
Protein Data Bank	N/A
GPCR-HGmod model	N/A
3D structure model	No available structures or models
BioLiP	N/A
Therapeutic Target Database	N/A
ChEMBL	CHEMBL3197
IUPHAR	14
DrugBank	N/A

Known ligands

You can:

Click GLASS IDs to check the association information.
Click ligand names to check details of the ligands.
Download a TSV version of all interaction information.
Download a SDF structure collection of all known ligands.

GLASS ID	Molecule	Formula	Molecular weight	H-bond acceptor / donor	XlogP	Lipinski's druglikeness
6609	carbachol	C6H15ClN2O2	182.648	3 / 1	N/A	N/A
12722	N,N'-Bis[2-[[5-(dimethylaminomethyl)-2-furanyl]methylthio]ethyl]-1-nitroethene-1,2-diamine	C22H35N5O4S2	497.673	10 / 2	2.7	Yes
22751	BRN 5352858	C18H28N2O2S2	368.554	6 / 0	2.5	Yes
25725	114724-56-0	C9H13N3O	179.223	4 / 0	0.8	Yes
25867	BRN 5360513	C24H32N2O2S2	444.652	6 / 0	3.8	Yes
28509	CHEMBL542404	C9H15ClN2O3	234.68	4 / 1	N/A	N/A
32445	CHEMBL552656	C12H21ClN2O3	276.761	4 / 1	N/A	N/A
34350	CHEMBL553727	C14H24ClN3O4	333.813	6 / 1	N/A	N/A
37029	CHEMBL538467	C6H11ClN2O2	178.616	3 / 2	N/A	N/A
37358	CHEMBL74823	C14H15ClN2O3	294.735	4 / 0	2.3	Yes
42822	BRN 5358078	C24H40N2O2S2	452.716	6 / 0	5.0	Yes
44049	CHEMBL553865	C12H21ClN2O2S	292.822	4 / 1	N/A	N/A
56727	BRN 5356180	C21H34N2O2S2	410.635	6 / 0	3.5	Yes
61315	CHEMBL540543	C16H21ClN2O3	324.805	4 / 1	N/A	N/A
77894	CHEMBL75380	C10H16N2O2S	228.31	4 / 0	1.1	Yes
97681	CHEMBL554011	C13H21ClN2O5	320.77	6 / 1	N/A	N/A
107035	BRN 5834442	C16H20N4O5S	380.419	8 / 1	3.2	Yes
109797	BRN 5836042	C16H21N5O5S	395.434	9 / 2	3.1	Yes
115815	CHEMBL75045	C14H16N2O2S	276.354	4 / 0	2.3	Yes
116431	arecoline	C8H13NO2	155.197	3 / 0	0.3	Yes
118986	CHEMBL542406	C10H17ClN2O3	248.707	4 / 1	N/A	N/A
131647	CHEMBL542879	C20H23Cl2N3O5	456.32	6 / 2	N/A	N/A
144919	CHEMBL542886	C8H13ClN2O3	220.653	4 / 2	N/A	N/A
148682	BDBM50005504	C22H35N5O4S2	497.673	10 / 1	1.9	Yes
156831	CHEMBL76063	C11H16N2O5	256.258	6 / 0	0.0	Yes
193481	BRN 5365697	C22H34N6O2S2	478.674	8 / 2	1.8	Yes
197053	CHEMBL553520	C10H17ClN2O3	248.707	4 / 1	N/A	N/A
206835	CHEMBL543832	C14H23ClN2O5	334.797	6 / 1	N/A	N/A
217465	BRN 5359326	C25H42N2O2S2	466.743	6 / 0	5.5	No
228661	BRN 5357514	C23H38N2O2S2	438.689	6 / 0	4.4	Yes
251623	BRN 5369860	C26H36N6O6S2	592.73	12 / 2	4.9	No
260547	physostigmine	C15H21N3O2	275.352	4 / 1	0.7	Yes
261024	BRN 5837136	C16H22N6O5S	410.449	10 / 3	3.0	Yes
281281	BRN 5354948	C20H32N2O2S2	396.608	6 / 0	3.2	Yes
298626	RS-86	C11H19BrN2O2	291.189	3 / 1	N/A	N/A
302877	CHEMBL544767	C9H15ClN2O3	234.68	4 / 1	N/A	N/A
303757	Oxotremorine	C12H18N2O	206.289	2 / 0	0.4	Yes
306443	BRN 5363156	C30H36N2O2S2	520.75	6 / 0	5.4	No
324390	CHEMBL555730	C9H15ClN2O3	234.68	4 / 2	N/A	N/A
359640	SCHEMBL8307259	C9H11F3N4O3	280.207	9 / 2	N/A	N/A
360946	Carbamylcholine	C6H15N2O2+	147.198	2 / 1	-0.4	Yes
368567	CHEMBL553123	C8H13ClN2O2S	236.714	4 / 2	N/A	N/A
382353	CHEMBL419451	C11H16N2O3	224.26	4 / 0	0.7	Yes
401042	CHEMBL306839	C10H15N3O4	241.247	5 / 1	-1.0	Yes
413002	Tacrine	C13H14N2	198.269	2 / 1	2.7	Yes
435495	BRN 5356615	C22H36N2O2S2	424.662	6 / 0	3.9	Yes
440556	BRN 5353847	C19H30N2O2S2	382.581	6 / 0	2.8	Yes