You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-(3,4-dihydro-1H-isoquinolin-2-ylsulfonyl)-4-methoxyphenyl]-5-(methylamino)-1,3-oxazole-4-carbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H20N4O4S
assistant