urb754 urb754 urb754 was originally reported by piomelli et al. to be a potent, noncompetitive inhibitor of monoacylglycerol lipase (mgl). however, recent studies have shown that urb754 failed to inhibit recombinant mgl, and brain faah activity was also resistant to urb754. in a later study by piomelli et al., the mgl-inhibitory activity attributed to urb754 is in fact due to a chemical impurity present in the commercial sample, identified as bis(methylthio)mercurane. urb754 names preferred iupac name 6-methyl-2-(4-methylanilino)-4h-3,1-benzoxazin-4-one identifiers cas number 86672-58-4 y 3d model (jsmol) interactive image chemspider 741376 n echa infocard 100.236.075 pubchem cid 848487 unii 7672nbp7zf y comptox dashboard (epa) dtxsid10357239 inchi inchi=1s/c16h14n2o2/c1-10-3-6-12(7-4-10)17-16-18-14-8-5-11(2)9-13(14)15(19)20-16/h3-9h,1-2h3,(h,17,18) nkey: gfwngvkcdgyfkg-uhfffaoysa-n ninchi=1/c16h14n2o2/c1-10-3-6-12(7-4-10)17-16-18-14-8-5-11(2)9-13(14)15(19)20-16/h3-9h,1-2h3,(h,17,18)key: gfwngvkcdgyfkg-uhfffaoyai smiles cc1=cc=c(c=c1)nc2=nc3=c(c=c(c=c3)c)c(=o)o2 properties chemical formula c16h14n2o2 molar mass 266.300 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references