| http://www.w3.org/ns/prov#value | - A compound of formula (ii) according to claim 10 in which w4 is methyl or methoxy, X is a direct bond and R is a group --NR1 R2 in which R1 is hydrogen or a methyl group and R2 is a non-aromatic (C3 -C15) carbocyclic radical, or one of its salts. 12.
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