在几个甾体生物碱中发现甾族化合物A环上存在有构象异构现象;应用NMR技术对该现象作了深入研究,还测定了互变异构体的活化自由能。这一现象的发现为甾族化合物的构象研究增添了新的内容。 In several steroid alkaloids, there was a conformational isomerism on the ring of steroid A; this phenomenon was further studied by NMR technique, and the free energy of activation of the tautomer was also determined. The discovery of this phenomenon has added new content to the conformational study of steroids.