Synonyms: (8r,9s,10r,14s,16s)-13-ethyl-17-ethynyl-16,17-dihydroxy-1,2,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-3h-cyclopenta[a]phenanthren-3-one(non-preferred name);16beta-Hydroxynorgestrel;AC1L4RQT;KST-1A5509;AR-1A7247;13-Ethyl-16beta,17-dihydroxy-18,19-dinor-17alpha-pregn-4-en-20-yn-3-one;(8R,9S,10R,14S,16S)-13-ethyl-17-ethynyl-16,17-dihydroxy-1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-3-one