prov:value
| - oyl, cypionyl, glucuronide and sulfonyl; R4 is selected from the group consisting essentially of hydrogen, hydroxy, lower alkoxy, lower acyloxy and halo; R5 is absent or is selected from the group consisting essentially of hydrogen, hydroxy, lower alkoxy and lower acyloxy; R6 is a hydrogen or a halo; and a represents optional aromatic unsaturation of ring A of said steroid, or b, c, and d
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