Synonyms: HalichondrinA, 12,13-dideoxy-10-hydroxy-;Dispiro[5H-furo[3,2-b]pyran-5,5'-[5H]furo[3,2-b]pyran-2'(3'H),23''(6''H)-[1,5:8,11:14,18]triepoxy[30,32]ethano[2,5]methano[2H,5H,28H]furo[2',3':5,6]pyrano[4,3-b]furo[2'',3'':5',6']pyrano[2',3':5,6]pyrano[3,2-i][1,4,8]trioxacyclopentacosin]-28''-one,tetracontahydro-1''-hydroxy-7,7',16'',26''-tetramethyl-10'',17''-bis(methylene)-2-(1,3,4-trihydroxybutyl)-,[1''S-[1''R*,2''S*,3''aR*,3''bR*,5''R*,8''R*,11''R*,14''R*,16''S*,18''S*,19''aR*,20''aR*,21''aS*,23''S*[3'aR*,5'S*[2R*(1R*,3S*),3aR*,7R*,7aR*],7'R*,7'aR*],24''aS*,25''aR*,26''S*,26''aS*,30''S*,31''aR*,32''R*,33''aS*]]-;Halistatin 1;Dispiro[5H-furo[3,2-b]pyran-5,5'-[5H]furo[3,2-b]pyran-2'(3'H),23''(6''H)-[1,5:8,11:14,18]triepoxy[30,32]ethano[2,5]methano[2H,5H,28H]furo[2',3':5,6]pyrano[4,3-b]furo[2'',3'':5',6']pyrano[2',3':5,6]pyrano[3,2-i][1,4,8]trioxacyclopentacosin]-28''-one,tetracontahydro-1''-hydroxy-7,7',16'',26''-tetramethyl-10'',17''-bis(methylene)-2-[(1S,3R)-1,3,4-trihydroxybutyl]-,(1''S,2S,2'S,2''R,3aS,3'aS,3''aR,3''bS,5R,5''R,7S,7'S,7aS,7'aS,8''S,11''S,14''S,16''R,18''R,19''aS,20''aS,21''aR,24''aR,25''aS,26''S,26''aR,30''R,31