You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[(8R,9S,13S,14S,17S)-3,17-dihydroxy-13-methyl-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthren-17-yl]pentanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H32O4
assistant