A new alkaloid alatamine 5 and an insecticidal alkaloid wilfordine 6 were isolated together with evonine 2, neo-evonine 3, and euonymine4 from Euonymus alatus forma striatus (Thunb.) Makino (family Celastraceae). The structures of alatamine 5 and wilfordine 6 were fully established by chemical and spectroscopic methods. Transformation of alatamine 5 to wilfordine 6 was made. © 1978.