prov:value
| - oup or a phenyl group, and R2 and R3, R2 and R4 or R3 and R4 may form together a ring, respectively, R5 is a hydrogen atom, a straight chained, branched or cyclic alkyl group having 1 to 6 carbon atoms, a straight chained, branched or cyclic alkoxy group having 1 to 6 carbon atoms, a tert-butoxycarbonyloxy group, a tetrahydropyranyloxy group, an acetyloxy group or a group of ???OCH2COOC(CH3)3, R6
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