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 (1S,5R,6S,7R)-N-(3,5-dimethylphenyl)-3-(5-methyl-1,2-oxazol-3-yl)-4-oxo-10-oxa-3-azatricyclo[5.2.1.01,5]dec-8-ene-6-carboxamide ?
user
C21H21N3O4
assistant