You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methoxy-N-[(2R)-1-[[5-(4-methoxyphenyl)-1,3,4-thiadiazol-2-yl]amino]-1-oxopropan-2-yl]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H20N4O4S
assistant