| http://www.w3.org/ns/prov#value | - each R4 is independently C6-C10 aryl or 5 to 10 membered heterocycle, wherein said aryl and heterocyclic groups are optionally replaced by 1 to 3 substituents independently selected from the group consisting of ???C(O)O(C1-C10 alkyl), C1-C10 alkoxy, C1-C10 alkanoyl, halo, nitro, cyano, 5 to 10 membered heterocycle, C6-C6 aryl, C1-C10 alkyl, ???NR2R3, ???S(O)n(C1-C10 alkyl) wherein n is an integer
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