You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[(3,4-dimethoxybenzoyl)-(5-methoxy-1,3-benzothiazol-2-yl)amino]ethyl-dimethylazanium into its molecular formula.
user
C21H26N3O4S+
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