prov:value
| - wherein R, R1, R2, R3, and R4 each, independently of the others, is an alkyl group, including saturated, unsaturated, cyclic, and unsubstituted alkyl groups, and wherein hetero atoms either may or may not be present in the alkyl group, an aryl group, including unsubstituted and substituted aryl groups, and wherein hetero atoms either may or may not be present in the aryl group, an arylalkyl group,
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