ADB-FUBINACA is a designer drug identified in synthetic cannabis blends in Japan in 2013. The (S) enantiomer of ADB-FUBINACA is claimed in Pfizer patent WO 2009/106982 and has been reported to be a potent agonist of the CB1 receptor and CB2 receptor with an EC50 value of 1.2 nM and 3.5 nM respectively. ADB-FUBINACA features a carboxamide group at the 3-indazole position, like SDB-001 and STS-135. ADB-FUBINACA appears to be the product of rational drug design, since it differs from AB-FUBINACA only by the replacement of the isopropyl group with a tert-butyl group.
An analogue of ADB-FUBINACA, ADSB-FUB-187, containing a more functionalized carboxamide substituent was recently reported.
Twenty-three ADB-FUBINACA major metabolites were identified in several incubations with cryopreserved human hepatocytes. Major metabolic pathways were alkyl and indazole hydroxylation, terminal amide hydrolysis, subsequent glucuronide conjugations, and dehydrogenation.
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