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 N-(2-methylpyridin-3-yl)-7-[(2R)-oxolane-2-carbonyl]-1-oxa-2,7-diazaspiro[4.4]non-2-ene-3-carboxamide .
user
C18H22N4O4
assistant