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16-dehydropregnenolone acetate dehydropregnenolone 16-dpa synthon semisynthetic steroid intermediate delftia acidovorans mtcc cholanic pregnadien diosgenin acetoxy chemical formula dpa cas molecular reaction cycloaddition 3d rendering molecule structural structure compound component reagent interaction pharmacophore prodrug hormone hormonal function action prohormone steroidal synthetic metabolite metabolism biosynthesis biosynthetic substrate precursor synthesis derivative metabolic