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 2-(2-methylphenyl)-5-[(4-prop-2-enoxyphenyl)methylidene]-[1,3]thiazolo[3,2-b][1,2,4]triazol-6-one .
user
C21H17N3O2S
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