| http://www.w3.org/ns/prov#value | - (a) for the preparation of a compound of structure 1 in which R4 is hydrogen from a compound of structure 1 in which R4 is an optionally substituted alkyl group that can be cleaved under acidic conditions, such as tert-butyl or aralkyl (for example Wang resin) and the like, by treatment with a strong acid, or (b) for the preparation of a compound of structure 1 in which R4 is hydrogen from a compo
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