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organic compounds
In determining whether mannose phenylhydrazone (C12H18N2O5) is cyclic or acyclic, chemical and spectroscopic methods have yielded contradictory results. X-ray crystallography has now shown that this compound occurs in acyclic form in the solid state. The conformation is closely similar to that assumed by mannose p-bromophenylhydrazone [Furberg & Solbakk (1969). Acta Chem. Scand. 23, 3248-3256], and the hydrogen-bonding arrangements found in the two structures are identical.