You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 4-(2-chloro-5-fluorophenyl)sulfonyl-6-methoxy-8-piperazin-1-yl-2,3-dihydro-1,4-benzoxazine ?
user
C19H21ClFN3O4S
assistant