Several sapogenin esters have recently been isolated from the skin of the toad
Bufo vulgaris forrnosus. This base has a specific rotation of [α]D145 - 14.9° (c 0.13,
CHC13). When crystallized from Et20 it forms clusters of colourless needles.
Shimada, Fujii, Niizaki, Tetrahedron Lett., 653 (1975)
