You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(2-chlorophenyl)-7-(5-methyl-2-pyridin-3-yl-1,3-thiazol-4-yl)-3,4-dihydro-2H-1,4-benzoxazine is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H18ClN3OS
assistant