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-[(3,4-dimethoxyphenyl)methyl]-1,3,4-thiadiazol-2-yl]carbamoyl]-5-nitrobenzoate .
user
C20H18N4O7S
assistant