21 hydroxy 11,19 oxidopregn 4 ene 3,20 dione 21 hydroxy 6,19 oxidopregn 4 ene 3,20 dione 21-hydroxy-11,19-oxidopregn-4-ene-3,20-dione 21-hydroxy-6,19-oxidopregn-4-ene-3,20-dione 21-hydroxylation Acetylation Aldosterone Hydroxylation Molecular Structure Oxidation-Reduction Progesterone Support, Non-U.S. Gov't acetylation aldosterone article chemical structure chemistry deoxycorticosterone drug derivative drug structure drug synthesis hydroxylation mineralocorticoid receptor oxidation reduction reaction oxido-bridged pregnanes progesterone steroidogenesis synthesis unclassified drug