You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,4S)-1-[4-(2-methoxyethoxy)-3-methylphenyl]sulfonyl-2-methyl-3,4-dihydro-2H-quinoline-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H26N2O5S
assistant