| http://www.w3.org/ns/prov#value | - It may be noted that, depending on the values of Y', Y1', R2', R3', A2', B2' and Y2', the products of formulae (IV), (Ii), (IVa), (Iii) and (IV'') may be compound of formula I and that, to obtain products or other compound of formula I, these
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