You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 2-but-2-ynoxy-1-[(8S,11R,13S,14S,17S)-13-methyl-3-nitroso-11-(4-pyrrolidin-1-ylphenyl)-1,2,3,6,7,8,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl]ethanone ?
user
C34H42N2O3
assistant