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-methylsulfanyl-8-propan-2-yl-N-[(2-thiophen-2-ylphenyl)methyl]pyrazolo[1,5-a][1,3,5]triazin-4-amine .
user
C20H21N5S2
assistant