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PATENT-PHARMA
| PATENT-PHARMA Patent applications | ||
| Patent application number | Title | Published |
|---|---|---|
| 20100179334 | HIGH PURITY PHTHALEIN DERIVATIVES AND METHOD FOR PREPARING SAME - High purity phthalein derivatives are useful for medical applications and/or in the field of biotechnology. The phthalein derivatives are prepared by a method whereby a phthalic anhydride derivative is condensed with a naphthol or phenol derivative in an organic acid ester and the crystals of the resulting condensate are converted by action of a strong acid or one of its precursors in anhydrous medium. | 07-15-2010 |