| http://www.w3.org/ns/prov#value | - The preferred stereoisomers of the compounds of Formula I wherein X is a direct bond, --CH.dbd.CH-- or --CH.sub.2 --CH.dbd.CH--, and Z is a group of Formula b are the 4R,6S and 4R,6R isomers and the racemate of which each is a constituent, i.e.,
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