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 N-butyl-2-[[4-(4-ethoxyphenyl)-5-pyridin-4-yl-1,2,4-triazol-3-yl]sulfanyl]acetamide .
user
C21H25N5O2S
assistant