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Four crystal modifications of acyclovir were isolated by recrystallization and characterized by powder X-ray diffractometry, differential scanning calorimetry, and thermogravimetric analysis. It was confirmed that Form 3 is a hydrate and Form 4 is an acetic acid solvate. The dissolution patterns of three crystal forms of acyclovir were studied in water at 37±0.5°C, 90 rpm for 120 minutes. The amount...
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