Buy article online - an online subscription or single-article purchase is required to access this article.
![c logo](https://journals.iucr.org/logos/jicons/c_36x36.png)
An equimolar mixture of stearic acid (octadecanoic acid) and nicotinamide (3-pyridinecarboxamide) in acetone yields crystals of a 1:1 complex, C18H36O2·C6H6N2O. In this structure, the 1:1 complex forms a dimer through hydrogen bonds between the amide groups, thus forming a lamellar structure. The alkyl chain of stearic acid has an all-trans conformation.