You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[4-amino-5-(phenoxymethyl)-1,2,4-triazol-3-yl]sulfanyl]-N-(4-methyl-3-nitrophenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H18N6O4S
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