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 5-ethyl-2-methyl-7-methylsulfanyl-3,6-dihydro-1H-[1,2,4]triazolo[1,5-c]triazine using the IUPAC nomenclature.
user
C8H17N5S
assistant