You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(8S,9S,13R,14S,17R)-17-[(E,2R)-5-hydroxy-5-prop-2-ynyloct-3-en-7-yn-2-yl]-2-methoxy-13-methyl-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthren-3-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H38O3
assistant