| http://www.w3.org/ns/prov#value | - These reactions prepare compounds of formulae (XIIIa), (XIa) and (VIIa), in each of which R11 is a hydrogen atom, that is to say compounds of formulae (XIII), (XI) and (VII), and a compound of formula (Va), which are starting materials used in Reaction Schemes E, D, A and B, respectively.
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