144789-03-7 5H,17H-1,23:11,13-Diethano-2H,14H-(1,11)dioxacycloeicosino(2,3-b:12,13-b')dipyridin-4a(24aH)-ol, octadecahydro-, (4aS-(4aR*,11R*,12aS*,16aS*,23R*,24aS*))- Demethylxestospongin B Demethylxestospongine B