Carbohydrates are polyhydroxy aldehydes (aldoses) or polyhydroxy ketones (ketoses) composed of C, H and O, or form polyhydroxy aldehydes or ketones upon hydrolysis. Carbohydrates come in the form of monosaccharides, disaccharides, oligosaccharides and polysaccharides. The simplest sugars, monosaccharides and disaccharides, consist of one or two monosaccharide units. Oligosaccharides are generally classified as carbohydrates containing 3-10 monosaccharide units. Polysaccharides contain more than 10 monosaccharide units and can be quite large. Glucose is an aldose, the most important monosaccharide in the body, used by cells as fuel. Other aldohexoses are galactose and mannose, which form part of complex molecules. Fructose is a ketohexose sugar, while ribose is the most important aldose pentose sugar and a component of RNA.
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Coumarin occurs naturally in a variety of plants, such as lentils, sweet sawdust, vanilla grass, and sweet grass. Coumarin has a simple structure, benzopyrone, associated with different reaction centers. Coumarins are further subdivided into different classes: simple coumarins, pyranocoumarins, furanocoumarins, dicoumarins and isocoumarins. Coumarin derivatives are an important class of natural plant metabolites with various biological activities. They can also be synthesized artificially, and various synthetic coumarin derivatives (azoles, sulfonyls, furans, pyrazoles, etc.) have shown good anticancer, antitumor and antiproliferative activities. Coumarin derivatives are not only effective anticancer agents, but also possess minimum side effects. Based on different substitution patterns, these potential active substances show a great ability to modulate potential anticancer activities.
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