You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[[3-ethoxycarbonyl-4-methyl-5-(methylcarbamoyl)thiophen-2-yl]amino]-2-oxoethyl]-methyl-[(3-methylthiophen-2-yl)methyl]azanium is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H26N3O4S2+
assistant