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The melting point of 264 ～ 265 ℃ (decomposition), specific rotation 117.7 ° (chloroform, C = 1). Soluble in chloroform, dichloromethane, glacial acetic acid, soluble in benzene, ethyl acetate, slightly soluble in acetone, methanol, ethanol, ethyl ether, acetic acid and citric acid in dilute aqueous solution..