Results Three compounds were isolated and identified as: opuntin B(I), 4 hydroxyproline(II) and tyrosine(III).Conclusion Compound I is a new alkaloid.

• 结果自仙人掌中分得3个化合物,分别鉴定为仙人掌素B(I)、羟脯氨酸(II)、酪氨酸(III)。