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 [3-[2-methyl-3-[[(5-nitro-4-thiocyanatopyrimidin-2-yl)amino]methyl]phenyl]phenyl]methylcarbamic acid .
user
C21H18N6O4S
assistant