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 N-(3,5-dimethylphenyl)-3-(5H-[1,2,4]triazino[5,6-b]indol-3-ylsulfanyl)propanamide using the IUPAC nomenclature.
user
C20H19N5OS
assistant