You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methyl-N-[[(3R)-oxolan-3-yl]methyl]-N-phenyl-6-(trifluoromethyl)pyridine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H19F3N2O2
assistant