You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[[5,7-bis(ethylamino)-[1,2,4]triazolo[4,3-a][1,3,5]triazin-3-yl]sulfanyl]-N-[4-(2-methyl-1,3-thiazol-4-yl)phenyl]acetamide into its molecular formula.
user
C20H23N9OS2
assistant