You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,3R,4R)-2-cyano-N-(3-fluorophenyl)-4-(hydroxymethyl)-3-phenylazetidine-1-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H16FN3O2
assistant