You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(Z)-[3-(2-methylpropyl)-4-phenyl-1,3-thiazol-2-ylidene]amino]-2-pyrazin-2-yloxyacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H21N5O2S
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