Molecular formula :
nature : control relies on polymer membrane to control drug release material. Drug delivery is another major categories. Such materials have semipermeable membrane properties, which are often used in silicone rubber, polyethylene-vinyl acetate copolymer, Polylvinylpyrolidone, drug packets in the production of these materials release capsule, slow-release drugs through the skin membrane gradually absorbed into the blood so as to achieve the goals of treatment.
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