prov:value
| - r (iv) a group of the formula ???CR87R57-, wherein R87 and R57 each, independently of the others, is a hydrogen atom, an alkyl group as defined for R80, R81, R82, R83, R84, and R85, an aryl group as defined for R80, R81, R82, R83, R84, and R85, an arylalkyl group as defined for R80, R81, R82, R83, R84, and R85, or an alkylaryl group as defined for R80, R81, R82, R83, R84, and R85, and (b) R80, R81
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