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 methyl 3,5,10,10-tetraoxo-15-phenoxy-10lambda6-thia-4,9-diazatetracyclo[9.3.1.02,6.02,8]pentadeca-1(15),11,13-triene-13-carboxylate .
user
C20H16N2O7S
assistant