You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(3R)-3-[4-(difluoromethyl)-3-methyl-[1,2]oxazolo[5,4-b]pyridin-6-yl]piperidin-1-yl]-(3-ethyl-1,2-oxazol-5-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H20F2N4O3
assistant