You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [(20S)-15-bromo-20-(4-methylphenyl)-19-oxa-3-thia-10-azapentacyclo[10.8.0.02,10.04,9.013,18]icosa-1,4,6,8,11,13(18),14,16-octaen-11-yl]-(4-methoxyphenyl)methanone .
user
C32H22BrNO3S
assistant