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 2-[[5-(2-methoxyphenyl)-4-methyl-1,2,4-triazol-3-yl]sulfanyl]-1-(2-methyl-1H-indol-3-yl)ethanone .
user
C21H20N4O2S
assistant