You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-prop-2-ynyl-3-[3-([1,2,4]triazolo[4,3-a]pyridin-3-yl)piperidine-1-carbonyl]benzenesulfonamide .
user
C21H21N5O3S
assistant