You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (1R,2S)-2-(4-bromophenyl)-1-[[5-(4-chlorophenyl)thiophen-2-yl]sulfonylamino]cyclopropane-1-carboxylic acid ?
user
C20H15BrClNO4S2
assistant