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 4-[(5-chlorothiophen-2-yl)methyl]-N-ethyl-N'-[[4-fluoro-3-(hydroxymethyl)phenyl]methyl]piperazine-1-carboximidamide ?
user
C20H26ClFN4OS
assistant