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 4-[(3S)-1-[[2-(4-methylpiperazin-1-yl)pyrimidin-4-yl]methyl]piperidin-3-yl]-5-methylsulfonylthiadiazole .
user
C18H27N7O2S2
assistant