(7R,8R,9S,10R,13S,14S,17R)-17-ethynyl-17-hydroxy-7,13-dimethyl-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3(2H)-one;Tibolone EP Impurity C
(7R,8R,9S,10R,13S,14S,17R)-17-ethynyl-17-hydroxy-7,13-dimethyl-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3(2H)-one;Tibolone EP Impurity C