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Terramycin hydrochloride is orthorhombic, space group is  P 2 1 2 1 2 1 , 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.

The crystal structure of terramycin hydrochloride, C 22 H 24 N 2 O 9 · HCl*