You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (3R,5R,8R,9S,10S,13S,14S)-2-(1,3-dioxolan-2-yl)-10,13-dimethyl-3-prop-2-enoxy-1,2,3,4,5,6,7,8,9,11,12,15,16,17-tetradecahydrocyclopenta[a]phenanthren-14-ol .
user
C25H40O4
assistant