You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-(3-chloro-4-methoxyphenyl)-N-[(4-methoxyphenyl)methyl]-3-methyl-6,7-dihydro-5H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazine-7-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H22ClN5O3S
assistant