You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [2-(5-chlorothiophen-2-yl)-2-oxoethyl] 2-(furan-2-carbonylamino)-4,5-dimethoxybenzoate by IUPAC nomenclature, provide its molecular formula.
user
C20H16ClNO7S
assistant