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 12-methyl-17-phenyl-2,13-dioxa-12,17-diazatetracyclo[8.7.0.03,8.011,15]heptadeca-1(10),3,5,7-tetraen-9-one ?
user
C20H18N2O3
assistant