1. 4-Aza-1-azoniabicyclo[2.2.2]octane–2-aminobenzoate–2-aminobenzoic acid (1/1/1)
2. Benzene-1,3-diol–1,4-diazabicyclo[2.2.2]octane (1/1)
3. Brandenburg, K. (2006). DIAMOND. Crystal Impact GbR, Bonn, Germany.
4. Johnson, C. K. (1976). ORTEPII. Report ORNL-5138. Oak Ridge National Laboratory, Tennessee, USA.
5. Molecular Structure Corporation & Rigaku (2005). CrystalClear. MSC, The Woodlands, Texas, USA, and Rigaku Corporation, Tokyo, Japan.