You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (2R,3R)-2-phenyl-4-(trifluoromethyl)-2,3-dihydro-1H-1,5-benzodiazepine-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H15F3N2O2
assistant