You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-acetyl-N-(6-phenyl-[1,3]thiazolo[3,2-b][1,2,4]triazol-2-yl)piperidine-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H19N5O2S
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