You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule [3-(2-amino-4-methyl-5,6-dihydro-1,3-thiazin-4-yl)phenyl]-(3,4-dihydro-1H-isoquinolin-2-yl)methanone ?
user
C21H23N3OS
assistant