You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-N-[[(7S)-7-bicyclo[4.2.0]octa-1,3,5-trienyl]methyl]-2-(4-ethyl-1,2,4-triazol-3-yl)morpholine-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H23N5O2
assistant