title: Understanding exceptional polymorphs.
authors.affiliation: Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK.
authors.forename: Jonathan W
authors.initials: JW
authors.lastname: Steed
mesh_terms: D006860:Hydrogen Bonding; D015394:Molecular Structure
keywords: Cambridge Structural Database; high-Z′ structures; packing principles; polymorphs