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 1-[[5-[N'-(3-bromophenyl)-N-hydroxycarbamimidoyl]thiophen-3-yl]methyl]-3-[4-(trifluoromethyl)phenyl]urea .
user
C20H16BrF3N4O2S
assistant