You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [(2R)-6-methyl-3,4-dihydro-2H-chromen-2-yl]-[(2S)-2-(1,2,4-oxadiazol-3-yl)azepan-1-yl]methanone .
user
C19H23N3O3
assistant