XEA

ARAGUSPONGINE A

(+)-XESTOSPONGIN A

[1R-(1R*,4AR*,11R*,12AS*,13R*,16AR*,23R*,24AS*)]-EICOSAHYDRO-5H,17H-1,23:11,13-DIETHANO-2H,14H-[1,11]DIOXACYCLOEICOSINO[2,3-B:12,13-B'] DIPYRIDINE