The Antiviral Antibiotic Feglymycin: First Direct‐Methods Solution of a 1000+ Equal‐Atom Structure

The double-helical structure adopted by the antiviral peptide feglymycin (see picture) is reminiscent of that of gramicidin, but feglymycin is more likely to function as an ion carrier than as a membrane channel. With more than 1000 unique atoms this is the largest equal-atom crystal structure solved by ab initio direct methods.