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Hyaluronic acid (HA) has recently been studied for its use in drug delivery applications. Medically, HA is used as a surgical aid in ophthalmology. It also possesses therapeutic potential in the treatment of arthritis and wound healing. HA-binding receptors, CD44 and receptor for hyaluronan-mediated motility have attracted much enthusiasm, mainly because they are believed to be involved in cancer metastasis. This review unravels the role of HA in drug delivery and targeting. Designing of various novel drug delivery systems using HA as a biopolymer will also be reviewed in the present article.

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Isoxazole, constituting an important family of five-membered heterocycles with one oxygen atom and one nitrogen atom at adjacent positions is of immense importance because of its wide spectrum of biological activities and therapeutic potential. It is, therefore, of prime importance that the development of new synthetic strategies and designing of new isoxazole derivatives should be based on the most recent knowledge emerging from the latest research. This review is an endeavor to highlight the progress in the chemistry and biological activity of isoxazole derivatives which could provide a low-height flying bird's eye view of isoxazole derivatives to the medicinal chemists for the development of clinically viable drugs using this information.