You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-(2-fluorophenyl)-2,2-dihydroxy-3-[4-(methylamino)butyl]-4H-2lambda4,1,3-benzothiadiazine-6-carbonitrile .
user
C19H23FN4O2S
assistant