You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named ethanimidoyl 2-[[8-methoxy-6-(5-methylpyrimidin-2-yl)quinazolin-4-yl]amino]propanimidothioate by IUPAC nomenclature, provide its molecular formula.
user
C19H21N7OS
assistant