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 N-[[3-[1-(2-cyanoethyl)piperidin-4-yl]-3,5,8,10-tetrazatricyclo[7.3.0.02,6]dodeca-1,4,6,8,11-pentaen-4-yl]methyl]butane-2-sulfonamide .
user
C21H29N7O2S
assistant