Synonyms: R 2956;AC1L55ZE;42438-88-0;R-2956;17beta-Hydroxy-2alpha,2beta,17alpha-trimethyl-8alpha-estra-4,9,11-trien-3-one;Estra-4,9,11-trien-3-one, 17-hydroxy-2,2,17-trimethyl-, (8alpha,17beta)-;(8R,13S,14S,17R)-17-hydroxy-2,2,13,17-tetramethyl-6,7,8,14,15,16-hexahydro-1H-cyclopenta[a]phenanthren-3-one