You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-ethylimino-N,2-dimethyl-N-(5-methylthiophen-3-yl)-2,5-dihydro-1H-1,3,5-triazin-4-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C12H19N5S
assistant