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-N-(5-ethylsulfonyl-2-fluorophenyl)-6-N-[5-(trifluoromethyl)pyridin-2-yl]pyrimidine-4,6-diamine ?
user
C18H15F4N5O2S
assistant