You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 4-(4-chlorophenyl)-2-[[2-(7-methylimidazo[1,2-a]pyridin-2-yl)acetyl]amino]thiophene-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H20ClN3O3S
assistant