You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (10R,13S,17R)-3-diazenyl-17-methoxy-10,13-dimethyl-3,8,9,11,12,14,15,16-octahydrocyclopenta[a]phenanthren-17-ol .
user
C20H28N2O2
assistant