prov:value
| - A compound of the formula I according to claim 1, in which n is zero or the number 1, R1 is C1 -C4 alkyl, methoxymethyl or phenyl, R2, R3, R4, R5, R6, R7 and R8 are each a hydrogen atom, X is an oxygen atom and Y is the radical ##STR37## in which Z is ethylene and R11 is a hydrogen atom or methyl.
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