Acanthospermal B

(3aS,6E,10Z)-3-Methylene-4α-(2-methylbutanoyloxy)-5β-acetoxy-6-formyl-10-(hydroxymethyl)-2,3,3aβ,4,5,8,9,11aα-octahydrocyclodeca[b]furan-2-one

(3aS,4S,5S,6E,10Z,11aR)-5-Acetoxy-2,3,3aβ,4,5,8,9,11aα-octahydro-10-(hydroxymethyl)-4-(2-methylbutyryloxy)-3-methylene-2-oxocyclodeca[b]furan-6-carbaldehyde

2-Methylbutyric acid (3aS,4S,5S,11aR,6E,10Z)-5-(acetyloxy)-6-formyl-2,3,3a,4,5,8,9,11a-octahydro-10-(hydroxymethyl)-3-methylene-2-oxocyclodeca[b]furan-4-yl ester