Abstract
Additional thirteen minor alkaloids (including an N-acetyl compound) were isolated from Stephania sasakii HAYATA. Among them, N-acetylstepharine, 7-oxocrebanine and dehydrophanostenine were new naturally occurring products, and the formulas 3, 14 and 12, determined from various spectral data and their chemical reactions, respectively. The others were five known compounds, such as N-methyl-6, 7-dimethoxy-1-isoquinolone (1), dehydroroemerine (9), cepharadione-A (15), lysicamine (13), cepharamine (16) and five unidentified alkaloids (Tentatively named E, F, G, H and I).