prov:value
| - a) for the preparation of a compound of formula I wherein Y is OR1 and Z is O, either reacting a compound of formula ##STR3## wherein X, R1, R3, R4 and R9 are as defined for formula I and X1 is a leaving group, preferably in the presence of a base, with a compound of formula ##STR4## wherein n, R2, R5 and R7 are as defined for formula I, or reacting a compound of formula ##STR5## wherein n, X, R2,
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