Synonyms: Spiro[2H-cyclohepta[b]furan-3(3aH),6'(2'H)-furo[2',3':5,6]cyclohepta[1,2-b]pyran]-2,2'-dione,7'-acetyl-3',3'a,4,4',4'a,7,8,8a,8'a,9',10',10'a-dodecahydro-8'a-hydroxy-7,9'-dimethyl-3'-methylene-6-(3-oxo-1-butenyl)-,[3'aR-[3'aa,4'aa,6'b[3aR*,6(E),7R*,8aS*],8'ab,9'b,10'aa]]-; Pungiolide A