| http://www.w3.org/ns/prov#value | - preferably phenyl or benzyl, or heteroaryl, substituted with one or more of N, O, or S, preferably from 1 to 2 of N, O, or S, more preferably from 1 to 2 of N; (W)pZS(O)r where Z is H, Na, a suitable mono- or di-valent cation, such as K, Mg, or Ca, alkyl, aryl, or heteroaryl as described above and r is an integer from 0 to 2, (W)pZ1Z2N where Z1 and Z2 are, independently, H, alkyl, aryl, or heteroa
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