You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-[(1R,2S,3S,4R)-4-[6-(dimethylamino)purin-9-yl]-2,3-dihydroxycyclohexyl]-6-methylpyridine-3-carboxamide ?
user
C20H25N7O3
assistant