Two laboratories have independently disclosed an interesting series of mechanism-based inhibitors. The dihydropyrrole 31, which appeared in a patent application , was reported to inhibit rat lung SSAO/VAP-1 with an IC50 = 500 nM. Recently, the Sayre team extended earlier work  and showed that these inhibitors, exemplified by 32, covalently bound to the enzyme with the cofactor in the reduced form . Presumably, aromatization of the dihydropyrrole moiety accounts for the observed potencies.
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