The crystal structure of terramycin hydrochloride, C22H24N2O9· HCl*

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Abstract
Terramycin hydrochloride is orthorhombic, space group is P212121, with cell constants a = 11.19 Å, b = 12.49 Å, c = 15.68 Å, with four formulae per unit cell. The crystal structure proposed by Takeuchi and Buerger in 1960 proved to be essentially correct and has been refined by Fourier and least-squares methods. The original R factor of 36% was reduced to 17.6% for 2100 reflections, and 14% if 350 non-observed reflections are excluded.Even though the structure of terramycin hydrochloride bears a close general resemblance to the structure of aureomycin hydrochloride reported by Hirokawa et al. and by Donohue et al., there are appreciable differences between them. Some chemical predictions about the terramycin structure made by Donohue on the bases of this recent investigation on aureomycin do not agree with the results reported here.

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