You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-benzylsulfanyl-6-methyl-4-thiophen-2-yl-1,4-dihydropyrimidine-5-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H20N2O2S2
assistant