Fx

Figure 3. 2-iso-Butylthiazole. OH

Figure 4. 2-Methyl-3-hydroxy-4(4ff)-pyrone (maltol).

Resins

Resins are natural products that can be obtained either directly from the plant as exudates or are prepared by alcohol extraction of plants that contain resinous materials. Naturally occurring resins are solids or semisolids at room temperature. They are soluble in alcohol or basic solutions but insoluble in water. They are usually noncrystalline and soften or melt on heating. Chemically, they are complex oxidation products of terpenes. They rarely occur in nature without being mixed with gums and/or volatile oils forming oleoresins.

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