Abstract
In addition to stephanthraniline A and stephanthraniline C, whose structures have been reported previously, five new pregnane derivatives, stephanthraniline B (12β-O, N-methyl-anthraniloyl-20-O-acetyldihydrosarcostin), SG-A (12β-O-(2-methylbutyryl)-20-O-acetylsarcostin), SG-B (20-O-(2-methylbutyryl) sarcostin), SG-C (20-O-tigloylsarcostin), and dihydrogagaminin (12β-O-cinnamoyl-20-O-nicotinoyl-dihydrosarcostin) were isolated from the aerial parts of Stephanotis japonica MAKINO (Asclepiadaceae) and their structures were determined. Penupogenin, kidjoranin, and gagaminin were also isolated and identified.
