You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[5-(phenoxymethyl)-4-prop-2-enyl-1,2,4-triazol-3-yl]sulfanylmethyl]imidazo[1,2-a]pyridine is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H19N5OS
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