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4'-hydroxy Flurbiprofen is a major active metabolite of the COX inhibitor flurbiprofen (Item No. 70250) and its enantiomers (R)-flurbiprofen (Item No. 70255) and (S)-flurbiprofen (Item No. 10004207).1 It is formed from flurbiprofen by the cytochrome P450 (CYP) isoform CYP2C9, including CYP2C9 containing an R144C substitution mutation. 4’-hydroxy Flurbiprofen inhibits COX-1 by 94% at a concentration of 1,000 µM but does not inhibit cyclooxygenation of arachidonic acid.2 It completely inhibits cyclooxygenation of 2-arachidonoyl glycerol (2-AG; Item No. 62160) when used at a concentration of 300 µM. 4'-hydroxy Flurbiprofen inhibits fatty acid amide hydrolase (FAAH) hydrolysis of anandamide in rat brain homogenates with an IC50 value of 84 µM at a pH of 6.
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1. Studies of flurbiprofen 4'-
2. Inhibition of endocannabinoid metabolism by the metabolites of ibuprofen and flurbiprofen. PLoS One 9(7), e103589 (2014).