Synonyms: 2-Butenoicacid, 2-methyl-,decahydro-7'-hydroxy-8'a-methyl-3'-methylene-2'-oxospiro[oxirane-2,6'(2'H)-oxireno[2,3]azuleno[4,5-b]furan]-4'-ylester, [3'aR-[3'aa,4'b(E),6'a,6'aa,7'b,7'ab,8'ab,8'ba,8'cb]]-; Spiro[oxirane-2,6'(2'H)-oxireno[2,3]azuleno[4,5-b]furan],2-butenoic acid deriv.; Eupachifolin E