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minocycline base, crystallized minocycline base, process for preparing crystalline minocycline base and process for preparing amorphous minocycline base.
minocycline base, crystallized minocycline base, process for preparing crystalline minocycline base and process for preparing amorphous minocycline base.
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机译:米诺环素碱,结晶米诺环素碱,结晶性米诺环素碱的制备方法和非晶态米诺环素碱的制备方法。
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摘要
The invention provides crystalline minocycline base. In particular, three crystalline polymorphic forms, designated Form I, Form II and Form III, of minocycline base are provided. These are characterized by XRD and IR data. Processes for preparing the new polymorphic forms are also provided. For example, Form I is prepared by dissolving and/or suspending amorphous minocycline base in an organic solvent chosen from ethers followed by crystallization from the mixture.
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