You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3R,6R,7S,8R,10S,11R,14R,15S,20S)-18-[(2S)-butan-2-yl]-7-[(1S)-1-(dimethylamino)ethyl]-8-hydroxy-6,10,15-trimethyl-17-oxa-19-azapentacyclo[12.8.0.03,11.06,10.015,20]docosa-1(22),18-dien-4-one by IUPAC nomenclature, provide its molecular formula.
user
C31H50N2O3
assistant