prov:value
| - of the formula ???CR50R60??? wherein R50 and R60 each, independently of the other, is a hydrogen atom, an alkyl group (including linear, branched, saturated, unsaturated, cyclic, unsubstituted, and substituted alkyl groups, and wherein hetero atoms, such as oxygen, nitrogen, sulfur, silicon, phosphorus, and the like either may or may not be present in the alkyl group), typically with from 1 to abo
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