You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule (E)-2-(3-chloro-4-methylsulfonylphenyl)-3-cyclopentyl-N-(5-thiophen-3-ylpyrazin-2-yl)prop-2-enamide ?
user
C23H22ClN3O3S2
assistant