You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 6-methyl-2-(5,6,7,8-tetrahydronaphthalene-2-carbonylamino)-4,5,6,7-tetrahydrothieno[2,3-c]pyridin-6-ium-3-carboxamide into molecular formula.
user
C20H24N3O2S+
assistant