prov:value
| - A compound of the formula I or II ##STR34## in which n is zero or the number 1, R1 is hydrogen, C1 -C4 alkyl which is unsubstituted or substituted by a chlorine atom or atoms, a C2 -C4 alkyl interrupted by an ether oxygen atom or atoms, phenyl or benzyl, R2, R3, R4, R5, R6 and R7 independently of one another are each a hydrogen atom, chlorine atom, C1 -C6 alkyl or phenyl, R8 is a hydrogen atom, ph
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