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Hydroxypropyl methylcellulose, at a molecular weight of 200,000, is a non-ionic cellulose ether derived from natural cellulose through a chemical modification process. It is formed by replacing some of the hydroxyl groups on the cellulose backbone with hydroxypropyl and methyl groups, thus altering its solubility and other characteristics. The '200,000' in HPMC 200000 refers to the average molecular weight, which influences its rheological behavior, viscosity, and dissolution rate.

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hydroxi methyl ethyl cellulos