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 1-[(2S)-4-(cyclopropanecarbonyl)-2-methyl-6-(1-methyltriazol-4-yl)-2,3-dihydroquinoxalin-1-yl]ethanone ?
user
C18H21N5O2
assistant