prov:value
| - A compound of formula (1): ##STR9## wherein the broken lines represent independently optional bonds, R1 and R2 being absent when the C12 -C13 double bond is present,A is OH, halo, C1 -C8 alkoxy, C1 -C9 alkanoyloxy, oxo, or oximino optionally substituted by a C1 -C8 alkyl, alkenyl, alkynyl, aryl, trialkyisilyl, aralkyl, C1 -C9 alkanoyl group or other group capable of being hydrolysed in vivo to the
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