An international team of researchers has observed two FK phases in the crystal structures of a derivative of pyridine. In their paper published in the journal Nature, the group describes their work with hydrochloride salt of fampridine that crystallized into four different structures. Kathryn Ashe, a writer for Nature has published a News & Views piece in the same journal issue outlining Frank–Kasper (FK) phases and where they are found and the work done by the researchers in this new effort.