You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[[[(1R,2S,3R,5R)-2,3-dihydroxy-5-pyridin-3-ylcyclopentyl]amino]methyl]benzonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H19N3O2
assistant