prov:value
| - (O or S)--R7, --N(R7,R8), --C(O)N(R7, R8) or --N(R7)C(O)R8, n is the number 1 or 0, with the proviso that R5 is hydrogen when n is the number 1, Ar is phenyl which is unsubstituted or substituted by up to 3 groups R9 or OR9, and R6, R7, R8 and R9 individually are hydrogen or C1-3 -alkyl, with the proviso that R4 is other than hydrogen when R3 is formyl and R5 is isobutyl or R3 is acetyl and R5 is
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