O. Nakamura et al., BRODIOSIDE B, A NOVEL (20R,22S)-SPIROSTANOL TETRASACCHARIDE FROM BRODIAEA-CALIFORNICA TUBERS, Chemistry Letters, (4), 1994, pp. 805-808
A novel (20R,22S)-spirostanol tetrasaccharide, named brodioside B, was
isolated from Brodiaea californica together with a new (25S)-ruscogen
in tetrasaccharide, named brodioside A. Their structures were determin
ed by extensive 2D NMR analysis and hydrolysis. Brodiosides A and B we
re active as a cyclic AMP phosphodiesterase inhibitor.