You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [(3aR,4R,7aS)-4-[(2-methylpyrimidin-4-yl)methyl]-1,3,3a,4,5,6,7,7a-octahydroisoindol-2-yl]-(2-methylpyrazol-3-yl)methanone .
user
C19H25N5O
assistant