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 N-(3,5-dimethoxyphenyl)-6-(3-methoxyphenyl)-1,1-dioxo-2,3-dihydroimidazo[2,1-b][1,3]thiazole-5-carboxamide .
user
C21H21N3O6S
assistant