A structure consisting of two co-crystallized compounds was determined for the Smith Research Group:
The crystal was orthorhombic, space group P212121, a=9.457(2), b=10.235(2), c=29.638(3) A. Molecule 1 forms a hydrogen-bonded "donut" into which a hydrogen-bonded column of molecule 2 is inserted.
Below is a Jmol depiction of the packing diagram with 1 in blue and 2 in green. If you rotate the diagram by 90 degrees about the horizontal axis, you will be looking down the column into the "donut". Hydrogen bonds are in red. (To rotate the unit cell in the frame below, depress the mouse button and drag in the frame.) Do a "right click" ("control-click" on a Mac) to pop-up a menu - Do "select > All" and "Render > Atoms > 100% vanderWaals" to draw a space filling model - you can see how the green "column" just fits through the blue "donut".