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 6-fluoro-10-methyl-5-(4-methylpiperazin-1-yl)-3-oxa-12-thia-14-azatetracyclo[6.5.2.04,15.011,14]pentadeca-1(13),4(15),5,7,10-pentaen-9-imine .
user
C18H19FN4OS
assistant