| http://www.w3.org/ns/prov#value | - The preferred stereoisomers of the compounds of Formula I wherein X is a direct bond or --CH???CH--, and Z is a group of Formula III are the 4R,6S and 4R,6R isomers and the racemate of which each is a constituent, i.e., the 4R,6S-4S,6R (trans lactone) and 4R,6R-4S,6S (cis lactone) racemates, with the 4R,6S isomer and the racemate of which it is a constituent being more preferred and the 4R,6S isom
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