You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-[4-(cyclopropylsulfamoyl)phenyl]-2-[(8-methyl-5H-[1,2,4]triazino[5,6-b]indol-3-yl)sulfanyl]acetamide ?
user
C21H20N6O3S2
assistant