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On chromatographing a technical-grade sample of (I), together with the main spot of (I) (Rf ~ 0.41) four additional spots were observed (Rf ~ 0.23, %0.29, ~0.5, and %0.69). The spots were eluted by 0.i N hydrochloric acid, and the optical density was measured at 255 nm on an SF-26 spectrophotometer. The impurity with Rf ~ 0.23 has a fair absorption in this… (More)