HPMC is a semi-synthetic, inactive, viscoelastic polymer often used as a lubricant in ophthalmology or as an excipient or excipient in orally administered drugs.
Ethyl cellulose is the ethyl ether of cellulose, a long-chain polymer with β-anhydroglucose as a unit linked by acetal, and is one of the most widely used water-insoluble cellulose derivatives.
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