Chemical name: 2,3,4,5,6-pentahydroxyhexanal. It is the most widely distributed and most important monosaccharide in nature. It is a polyhydroxy aldehyde. Pure glucose is colorless crystal, sweet but not as sweet as sucrose, soluble in water, slightly soluble in ethanol, and insoluble in ether. The natural glucose aqueous solution is optically responsive to the right, so it belongs to "dextrose".