prov:value
| - Ar is a radical selected from the group consisting of unsubstituted carbocyclic and heterocyclic aryl and carbocyclic and heterocyclic aryl substituted by one or more radicals selected from the group consisting of alkyl, carbocyclic aryl or aralkyl, fluoro, chloro, cyano, nitro, OR4, S-alkyl, COR4, CO2 R4, and SO3 R4, wherein R4 is hydrogen, alkyl, carbocyclic aryl or aralkyl; and R1, R2, and R3 a
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