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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.
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GPCR

Name	Mu-type opioid receptor
Species	Rattus norvegicus (Rat)
Gene	Oprm1
Synonym	Opioid receptor B opioid receptor OP3 mu receptor MOR-1 MOPr MOP M-OR-1 opioid receptor, mu 1 [ Show all ]
Disease	N/A for non-human GPCRs
Length	398
Amino acid sequence	MDSSTGPGNTSDCSDPLAQASCSPAPGSWLNLSHVDGNQSDPCGLNRTGLGGNDSLCPQTGSPSMVTAITIMALYSIVCVVGLFGNFLVMYVIVRYTKMKTATNIYIFNLALADALATSTLPFQSVNYLMGTWPFGTILCKIVISIDYYNMFTSIFTLCTMSVDRYIAVCHPVKALDFRTPRNAKIVNVCNWILSSAIGLPVMFMATTKYRQGSIDCTLTFSHPTWYWENLLKICVFIFAFIMPVLIITVCYGLMILRLKSVRMLSGSKEKDRNLRRITRMVLVVVAVFIVCWTPIHIYVIIKALITIPETTFQTVSWHFCIALGYTNSCLNPVLYAFLDENFKRCFREFCIPTSSTIEQQNSTRVRQNTREHPSTANTVDRTNHQLENLEAETAPLP
UniProt	P33535
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	CHEMBL270
IUPHAR	319
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
270	CHEMBL132776	C31H43N7O8	641.726	9 / 9	-0.4	No
574	CHEMBL44172	C25H31N5O7	513.551	8 / 7	-3.4	No
589	CHEMBL213366	C47H69N7O3	780.115	10 / 9	5.3	No
593	Tyr-Pro-Emp-Phe-NH2	C35H43N5O5	613.759	6 / 5	3.8	No
627	CHEMBL134023	C32H44N8O8	668.752	9 / 9	-0.8	No
694	CHEMBL76086	C31H41N5O7S2	659.817	10 / 7	-0.3	No
697	CHEMBL310681	C31H41N5O7S2	659.817	10 / 7	-0.3	No
701	CHEMBL80626	C31H41N5O7S2	659.817	10 / 7	-0.3	No
706	CHEMBL307614	C31H41N5O7S2	659.817	10 / 7	-0.3	No
463063	CHEMBL3634916	C68H105N23O13	1452.74	18 / 20	-3.6	No
1229	CHEMBL143800	C23H25NO3	363.457	4 / 1	3.6	Yes
1438	CHEMBL1929362	C27H30N2O	398.55	3 / 1	5.8	No
1511	CHEMBL556537	C70H89F6N11O15	1438.53	22 / 14	5.8	No
1530	SB-0304	C25H29N5O5	479.537	6 / 4	-0.2	Yes
1767	CHEMBL1186493	C23H27ClN4	394.947	4 / 2	5.6	No
1842	CHEMBL2310837	C20H25ClN2O	344.883	2 / 0	4.0	Yes
2053	BDBM50027090	C22H25BrN2O4	461.356	5 / 2	2.2	Yes
2055	CHEMBL608248	C22H25BrN2O4	461.356	5 / 2	2.2	Yes
441748	CHEMBL3326662	C33H50N6OS2	610.924	5 / 2	5.3	No
521514	CHEMBL3759981	C43H51N7O7	777.923	8 / 8	3.4	No
463227	CHEMBL3609619	C32H30F6N4O5	664.605	12 / 5	4.5	No
3169	CHEMBL557188	C60H72F6N10O9	1191.29	16 / 10	7.4	No
3241	CHEMBL124642	C23H31N3O	365.521	3 / 0	3.5	Yes
547942	CHEMBL95302	C19H23N5O4	385.424	8 / 4	2.3	Yes
3553	CHEMBL405672	C53H71N11O10S2	1086.34	14 / 13	2.5	No
3569	CHEMBL231049	C24H31N3O2	393.531	3 / 1	2.7	Yes
3719	CHEMBL451962	C34H39N5O4	581.717	5 / 4	4.1	No
3901	CHEMBL2371018	C38H40N4O6	648.76	7 / 5	2.3	No
3904	CHEMBL2371027	C38H40N4O6	648.76	7 / 5	2.3	No
3946	CHEMBL298893	C16H24N2O2	276.38	3 / 1	2.4	Yes
3947	CHEMBL609676	C16H24N2O2	276.38	3 / 1	2.4	Yes
4453	CHEMBL230943	C27H31N3O2	429.564	3 / 1	4.1	Yes
4479	H-Tyr-Tic-Cha-Phe-OH	C37H44N4O6	640.781	7 / 5	3.1	No
4482	CHEMBL2371935	C37H44N4O6	640.781	7 / 5	3.1	No
4825	CHEMBL2338752	C32H39NO4	501.667	5 / 2	5.2	No
5321	CHEMBL161147	C23H24ClN3O2	409.914	4 / 0	4.4	Yes
5387	CHEMBL353990	C21H31N3O	341.499	3 / 1	4.2	Yes
463567	CHEMBL3613884	C27H34F3N3O3	505.582	8 / 2	N/A	No
5837	BDBM50321606	C80H98N18O14	1535.78	17 / 18	2.2	No
5871	CHEMBL347750	C21H28N2O2	340.467	3 / 3	3.5	Yes
5959	CHEMBL151416	C29H36N2O	428.62	3 / 1	6.5	No
6029	CHEMBL101072	C37H54N4O3	602.864	5 / 4	5.9	No
6397	CHEMBL385779	C34H48N6O5	620.795	8 / 7	2.5	No
6492	CHEMBL155797	C30H34ClN3O2	504.071	4 / 1	6.1	No
521644	CHEMBL3770677	C27H31N3O2	429.564	4 / 4	4.6	Yes
6950	CHEMBL102013	C42H63N5O3	685.998	5 / 4	7.3	No
6966	CID 69083551	C24H29ClN6	436.988	4 / 3	5.0	Yes
7461	CHEMBL1076738	C52H60N10O8	953.114	10 / 10	3.0	No
7665	CHEMBL278889	C33H38N6O6	614.703	7 / 6	1.8	No
7948	CHEMBL2048983	C19H29NO5	351.443	6 / 2	N/A	N/A
8144	CHEMBL557243	C32H35N5O5	569.662	6 / 5	2.5	No
8361	CHEMBL315603	C32H50N8O10	706.798	11 / 10	-3.1	No
8565	CHEMBL3216028	C23H30Cl4N4	504.321	4 / 5	N/A	No
8751	CHEMBL3217121	C24H30Cl4N6	544.346	4 / 6	N/A	No
8889	CHEMBL409907	C30H35N5O4	529.641	6 / 4	2.9	No
9156	CHEMBL188565	C18H24N4O	312.417	3 / 2	2.2	Yes
9525	CHEMBL121946	C38H54N8O10	782.896	11 / 10	-1.5	No
9639	CHEMBL161512	C18H22N2O2	298.386	3 / 1	3.1	Yes
9662	CHEMBL149795	C29H36N2O2	444.619	4 / 2	5.5	No
9918	CHEMBL175116	C39H56N8O10	796.923	11 / 10	-1.0	No
9957	CHEMBL387670	C61H73F6N9O10	1206.3	17 / 8	8.1	No
10055	H-Tyr-D-Ala-Gly-Phe-Met-NH2	C28H38N6O6S	586.708	8 / 7	-0.1	No
11252	CHEMBL159793	C32H43N5O7S2	673.844	10 / 7	0.1	No
11261	SCHEMBL9880436	C25H28N2O7	468.506	8 / 4	1.3	Yes
11303	CHEMBL422877	C31H37N3O2	483.656	4 / 1	5.4	No
11330	Norbinaltorphimine	C40H43N3O6	661.799	8 / 5	3.2	No
11349	CHEMBL93614	C22H29NO2	339.479	3 / 2	4.5	Yes
11612	BDBM50098673	C25H24N2O3	400.478	4 / 3	3.7	Yes
11615	CHEMBL611697	C25H24N2O3	400.478	4 / 3	3.7	Yes
11983	CHEMBL346165	C27H27N3O3	441.531	5 / 2	2.9	Yes
12085	CHEMBL1089542	C25H35N5O	421.589	3 / 2	2.7	Yes
12155	CHEMBL381793	C28H27FN4O	454.549	4 / 2	4.2	Yes
12189	CHEMBL415795	C64H106N22O12	1375.69	17 / 19	-2.4	No
12194	CHEMBL262963	C64H106N22O12	1375.69	17 / 19	-2.4	No
464402	CHEMBL3580743	C37H43F2N7O7	735.79	10 / 8	1.6	No
12984	CHEMBL323024	C29H38N6O6	566.659	7 / 7	0.4	No
13229	CHEMBL146108	C25H33N3O3	423.557	4 / 3	3.1	Yes
13378	CHEMBL606959	C34H35N3O6	581.669	8 / 5	1.7	No
13435	CHEMBL2370599	C20H32N4O5	408.499	6 / 6	0.4	No
536348	CHEMBL91760	C23H30N6O5	470.53	7 / 7	-0.8	No
13720	CHEMBL132775	C33H46N8O8	682.779	9 / 9	-0.9	No
521855	CHEMBL3823054	C33H51N9O5	653.829	8 / 9	0.4	No
14025	CHEMBL1766208	C61H74F6N10O9S	1237.37	17 / 10	7.3	No
14085	CHEMBL611925	C57H64F6N10O9S2	1211.31	18 / 10	6.0	No
14090	CHEMBL611924	C57H64F6N10O9S2	1211.31	18 / 10	6.0	No
14189	CHEMBL132164	C41H59N9O9	821.977	10 / 10	1.2	No
464635	CHEMBL3582484	C37H44FN7O7	717.799	9 / 8	1.5	No
14428	CHEMBL2369473	C53H70N12O12S2	1131.33	16 / 14	-0.4	No
14589	CHEMBL2402930	C32H43N9O6	649.753	8 / 8	-0.8	No
14596	CHEMBL327270	C25H27ClN2O2	422.953	3 / 0	6.0	No
15134	CHEMBL99496	C18H27NOS	305.48	3 / 1	2.9	Yes
15135	CHEMBL97918	C18H27NOS	305.48	3 / 1	2.9	Yes
15136	CHEMBL98817	C18H27NOS	305.48	3 / 1	2.9	Yes
15137	CHEMBL98650	C18H27NOS	305.48	3 / 1	2.9	Yes
15523	CHEMBL2371213	C51H70N12O10S2	1075.31	15 / 14	0.5	No
15567	CHEMBL572875	C26H45N3	399.667	3 / 1	6.5	No
15716	CHEMBL179350	C27H32N2O5	464.562	7 / 0	3.2	Yes
15747	BDBM50085059	C47H63N13O11S3	1082.28	16 / 14	-1.0	No
15852	CHEMBL2338749	C31H43NO4	493.688	5 / 2	5.6	No
16132	H-Tyr-D-Ala-Gly-Phe-Pro-Leu-Trp-O-Bzl	C52H62N8O9	943.115	10 / 8	5.0	No