- Compounds having the structure RN=CR2 (R = H, @H02891@). Thus analogues of @A00208@ or @K03386@, having NR doubly bonded to carbon; @A00209@ have the structure RCH=NR, @K03381@ have the structure R'2C=NR (R' ≠ H). Imines include @A00564@ and @S05498@. Imine is used as a suffix in systematic nomenclature to denote the C=NH group excluding the carbon atom.
- [obsolete] An obsolete term for azacycloalkanes.