prov:value
| - wherein R5 is C1???C12 alkyl; R6???R8 are each independently selected from the group consisting of hydrogen, C1???C18 hydrocarbyl, C2???C18 hydrocarbyloxycarbonyl, nitrile, formyl, carboxylate, imidate, and thiocarboxylate; R9???R13 are each independently selected from the group consisting of hydrogen, halogen, C1???C12 alkyl, hydroxy, and amino; and wherein Y is a divalent group selected from the
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