Four N 7-benzyl-substituted 4,5,6,7-tetra-hydro-1H-pyrazolo[3,4- b]pyri-dine-5-spiro-1′-cyclo-hexane-2′,6′-di-ones as ethanol hemisolvates: Similar mol-ecular constitutions but different crystal structures

1. Cruz, S.
2. Trilleras, J.
3. Cobo, J.
4. Low, J.N.
5. Glidewell, C.