You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 4,5-dimethyl-2-[[2-[(6-oxo-1,7-dihydropurin-2-yl)sulfanyl]acetyl]amino]thiophene-3-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H17N5O4S2
assistant