You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(13S)-2-[3-[(13S)-2-ethoxy-3-formamido-13-methyl-17-methylidene-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthren-16-yl]prop-1-ynyl]-13-methyl-17-methylidene-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthren-3-yl]formamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C45H54N2O3
assistant