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Identification of a bioactive impurity in a commercial sample of 6-methyl-2-p-tolylaminobenzo[d][1,3]oxazin-4-one (URB754)

  • Author(s): Tarzia, G
  • Antonietti, F
  • Duranti, A
  • Tontini, A
  • Mor, M
  • Rivara, S
  • Traldi, P
  • Astarita, G
  • King, A
  • Clapper, JR
  • Piomelli, D
  • et al.
Abstract

The compound URB754 was recently identified as a potent inhibitor of the endocannabinoid-deactivating enzyme monoacylglycerol lipase (MGL) by screening of a commercial chemical library. Based on HPLC/MS, NMR and EI/MS analyses, the present paper shows that the MGL-inhibitory activity attributed to URB754 is in fact due to a chemical impurity present in the commercial sample, identified as bis(methyithio)mercurane. Although this organomercurial compound is highly potent at inhibiting MGL (IC50= 11.9±1.1 nM), its biological use is prohibited by its toxicity and target promiscuity.

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