| http://www.w3.org/ns/prov#value | - and isomers where R1 and R2 are reversed, where R1 and R2 are as shown above, p, q and r are each independently 0 to 5, preferably 0 or 1 and Ry is the free acid, an R1 ester or a conventional pharmaceutically acceptable carboxy protecting group, such as the methyl, benzyl or especially the ethyl ester.
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