prov:value
| - l, or mixtures thereof; R2 is a member selected from the group consisting of hydrogen, C1 alkyl, C2 alkyl, C3 alkyl, C4 alkyl, C5 alkyl, C6 alkyl, or mixtures thereof; provided that R1 and R2 cannot both be alkyl; R3 is a member selected from the group consisting of hydrogen, aromatic, or mixtures thereof; R4 is a member selected from the group consisting of hydrogen, aromatic, or mixtures thereof
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