You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(3S,5R,8R,10S,13S,17S)-3-ethyl-13-methyl-1,2,3,4,5,6,7,8,9,10,11,12,14,15,16,17-hexadecahydrocyclopenta[a]phenanthren-17-yl]-2-pyrazol-1-ylethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H38N2O
assistant