| http://www.w3.org/ns/prov#value | - L is a labile group such as toluenesulfonate, methanesulfonate or a halogen atom, the isomers of which have been optionally prepared by a conventional preparation technique, to lead to a compound of formula (I/b), a particular case of compounds of formula (I) ##STR10## in which X and R1 have the same meaning as above, the isomers of which are optionally separated by a conventional separation techn
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