You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 4-[2-[[C-[4-(3-ethyl-1,2,4-thiadiazol-5-yl)piperazin-1-yl]-N-methylcarbonimidoyl]amino]ethyl]benzoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H28N6O2S
assistant