You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [4-(imidazo[1,2-a]pyridin-2-ylmethyl)piperazin-1-yl]-(6-methylpyridin-3-yl)methanone into its molecular formula.
user
C19H21N5O
assistant