emodin

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emodin

[′em·ə·dən]
(organic chemistry)
C14H4O2(OH)3CH3 Orange needles crystallizing from alcohol solution, melting point 256-257°C, practically insoluble in water, soluble in alcohol and aqueous alkali hydroxide solutions, occurs as the rhamnoside in plants such as rhubarb root and alder buckthorn; used as a laxative.