You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[2-[2-[[4-(4-cyanophenyl)-1,3-thiazol-2-yl]amino]ethylamino]acetyl]pyrrolidine-2-carbonitrile into its molecular formula.
user
C19H20N6OS
assistant