Seven kinds of basic crystals were isolated from Asimina triloba DUNAL. (paw-paw), cultivated in Japan. (Table I) Among them, asimilobine, C17H17O2N, m.p. 177-179°, [α]D -213° (CHCl3) was found to be a new base and the structure was certified to be the secondary aporphine type phenolic base, IIa.