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**Molecular formula:** C₁₂H₂₂O₁₁
**Molar mass:** 342,30 g/mol
**Information:** Lactose (also called milk sugar) is composed of one molecule of D-glucose and one molecule of D-galactose. It is indigestible for a part of the population in the adult state.
**Appearance:** It is present in milk of mammals (4-7 %).
