lycotonine-type diterpenoid alkaloids were screened for cardiotonicactivity revealed that lycoctonine had moderate cardiac effect. In this study, a series of structurally diverse of lycoctonine were synthesized by modifying on B-ring, -ring, E-ring, F-ring, -atom or salt formation on lycoctonine skeleton. We evaluated the cardiotonicactivity of the derivatives by isolated frog heart, aiming to identify