You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 5-[7-(1,3-benzothiazol-6-yl)-5H-pyrrolo[2,3-b]pyrazin-2-yl]-2-methylbenzoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H16N4O2S
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