prov:value
| - Alternatively, the groups R1, R2, and R3 may be independently selected from alkyl, aryl, aralkyl, alkaryl, cycloalkyl, alkcycloalkyl and cycloalkalkyl and each have from 1 to 36 carbon atoms per group, provided that if one of R1, R2, and R3 is an alkyl group having from 6 to 36 carbon atoms per group, then the other two of R1, R2, and R3 cannot both be alkyl groups having from 1 to 5 carbon atoms
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