“…There was, in addition, a zone at the very top and one near the bottom of the column. From the sharp middle zone there was obtained 66 mg. of crystalline material having the melting point 132-135°, and giving an undepressed melting point when mixed with a known sample of n-arabonic acid tetraacetate; literature (22) melting point, 135-136°. The rotation, [«]" +31.1°(2.1% in chloroform), is in agreement with the literature value (21), [«]" +32.5°, for n-arabonic acid tetraacetate.…”