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 1,2-oxazol-5-yl-(2-phenylspiro[5,7-dihydropyrano[4,3-d]pyrimidine-8,3'-pyrrolidine]-1'-yl)methanone .
user
C20H18N4O3
assistant