V. Videnova-adrabinska et E. Janeczko, Urea-picoline N-oxide (4 : 2) cocrystal: an unusual channel inclusion compound, CHEM COMMUN, (16), 1999, pp. 1527-1528
The crystal structure of urea-picoline N-oxide cocrystal reveals urea chann
el formation in which two independent picoline N-oxide molecules are stacke
d with their charge-transfer axes aligned approximately at 60 degrees towar
d the crystallographic b-axis.