Synonyms: 4-Hydroxypregn-4-ene-3,20-dione;4-Hydroxyprogesterone;BRN 2062556;Pregn-4-ene-3,20-dione, 4-hydroxy-;AC1L4VBG;AC1Q6OJ2;650-66-8;AR-1G2876;LS-118692;(8S,9S,10R,13S,14S,17S)-17-acetyl-4-hydroxy-10,13-dimethyl-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-one