Glucose is an organic compound with the formula C6H12O6. It is the most widespread and important monosaccharide in nature and a polyhydroxyaldehyde. Pure glucose is a colorless crystal with sweet taste, but not as sweet as sucrose, easily soluble in water, easily soluble in ethanol, insoluble in ether. Natural aqueous glucose solution is optically turned to the right, so belongs to the "dextrose".