prov:value
| - oups, R2 is a hydrogen atom or a C1 -C4 -alkyl radical, n is the number 2, 3 or 4, A is a hydrogen atom or one of the radicals --CO--R5 or --NR6 --CO--R7, R5 is a phenyl group which is unsubstituted or mono- or disubstituted by fluorine, chlorine, bromine or a hydroxyl, nitro, amino, C1-4 -alkanoylamino, C1-4 -alkylamino, C1 -C4 -alkyl or methoxy group or a naphthyl group which is unsubstituted or
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