You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-[4-[(4-ethyl-3-pyridin-4-yl-5-sulfanylidene-1,2,4-triazol-1-yl)methyl]piperazin-1-yl]pyridine-4-carbonitrile .
user
C20H22N8S
assistant