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 3-[6-(5-chlorothiophen-2-yl)pyridin-3-yl]-1-(1-ethylsulfonylpiperidin-4-yl)-1-methylurea;ethene .
user
C20H27ClN4O3S2
assistant