You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 3-(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl)-N-(2-imidazo[1,2-a]pyridin-2-ylethyl)propanamide ?
user
C19H21N7O
assistant