C5H9N
# C5H9N

The molecular formula $C_5H_9N$ (molar mass: 83.1317 g/mol, exact mass: 83.073499) may refer to:

* Pentanenitrile, n-BuCN, i.e. $C_4H_9–C≡N$
* Pivalonitrile, t-BuCN, i.e. $(CH_3)_3C–C≡N$
* tert-Butyl isocyanide, t-BuNC, i.e. $(CH_3)_3C–N^+≡C:^−$
* Tetrahydropyridine
