| http://www.w3.org/ns/prov#value | - To prepare the compounds of formula I, wherein A is hydrogen, a compound having the formula ##STR16## wherein R, Z1 and Z2 have the meaning given above and x is a whole number equal to 0 or 1 is reacted with a compound having the formula ##STR17## wherein Y and R' have the meaning given above, the molar ratio of compound III to compound II being y:1 wherein y is a number equal to (n-x), n having t
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