2-(4-Bromophenyl)-1, 2-dihydropyrimido[1, 2-a]benzimidazol-4(3H)-one and 4-(4-methylphenyl)-3, 4-di-hydropyrimido[1, 2-a]benzimidazol-2(1H)-one form hydrogen-bonded base-paired dimers

1. Low, J.N.
2. Cobo, J.
3. Insuasty, B.
4. Nogueras, M.
5. Salcedo, A.
6. Sánchez, A.