You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[4-[2,5-dimethyl-1-(1,3-thiazol-2-yl)pyrrol-3-yl]-1,3-thiazol-2-yl]methyl]-1,3-benzothiazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H16N4S3
assistant