| http://www.w3.org/ns/prov#value | - Chem., 1997, (20), 279-290) followed by functional group interchangeand/or protection using methods well known in the art, to give the individual cis- or trans-isomers of a compound of formula (X): ##STR15##wherein R.sup.2 is as hereinbefore defined, and P is a protecting group, for example trifluoroacetyl or tert-butoxycarbonyl.
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