p-chloromercuribenzoate ( k0.5 = 13 microm ) , hg2+ ( k0.5 = 16 microm ) , zn2+ ( k0.5 = 0.8 mm ) and vanadate ( k0.5 = 7 microm ) also abolished activity , as did various anions ( scn- greater than i- greater than cl- greater than so4 ( 2- ) .
C0042305
vanadate
C0003075
anions