Limonin and nomilin were isolated from seeds of Citrus sinensis Osbeck.Their structures were determined by IR,1H NMR and MS spectra.

• 从甜橙种子中提取纯化了的2种柠檬苦素类化合物，经熔点、红外光谱、核磁共振测定为柠檬苦素和诺米林。