You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (1R,5S,6R,7S)-3-cycloheptyl-N-methyl-4-oxo-N-(pyrazin-2-ylmethyl)-10-oxa-3-azatricyclo[5.2.1.01,5]dec-8-ene-6-carboxamide .
user
C22H28N4O3
assistant