You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 4-ethyl-3-[(3-nitrophenyl)methylsulfanyl]-5-[(E)-2-phenylethenyl]-1,2,4-triazole using the IUPAC nomenclature.
user
C19H18N4O2S
assistant