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 (4-methyl-2-phenyl-1,3-oxazol-5-yl)-(1-oxa-7-azaspiro[3.5]nonan-7-yl)methanone .
user
C18H20N2O3
assistant