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-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-ylidene)methyl]-2-methoxyphenyl] N-phenylcarbamate .
user
C21H19NO7
assistant