((2R,3aS,5S,5'R,6S,6''S,7aS)-2-(((tert-butyldiphenylsilyl)oxy)methyl)-6-methyldecahydro-4''H-trispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran-3'',2'''-[1,3]dithian]-6''-yl)methanol

((2R,3aS,3''R,5S,5'R,6S,6''S,7aS)-2-(((tert-butyldiphenylsilyl)oxy)methyl)-3''-hydroxy-6-methyldodecahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)methyl benzoate

perfluorophenyl (2R,3aS,5R,5'R,6S,6''S,7aS)-6-methyl-6''-((E)-5-(pivaloyloxy)pent-1-en-1-yl)-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-2-carboxylate

((2R,3aS,5R,5'R,6S,6''S,7aS)-2-(((tert-butyldiphenylsilyl)oxy)methyl)-6-methyl-3''-(((trifluoromethyl)sulfonyl)oxy)-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)methyl benzoate

((2R,3aS,3''R,5R,5'R,6S,6''S,7aS)-2-(((tert-butyldiphenylsilyl)oxy)methyl)-3''-hydroxy-6-methyldodecahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)methyl benzoate

((2R,3aS,5S,5'R,6S,6''S,7aS)-2-(((tert-butyldiphenylsilyl)oxy)methyl)-6-methyl-3''-oxododecahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)methyl benzoate

(2R,3aS,5R,5'R,6S,6''S,7aS)-6-methyl-6''-((E)-5-(pivaloyloxy)pent-1-en-1-yl)-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-2-carboxylic acid

tert-butyl(((2R,3aS,3''R,5R,5'R,6S,6''S,7aS)-6-methyl-3''-((triethylsilyl)oxy)-6''-vinyldodecahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-2-yl)methoxy)diphenylsilane

(2R,3aS,5R,5'R,6S,6''S,7aS)-6-methyl-6''-((pivaloyloxy)methyl)-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-2-carboxylic acid

((2R,3aS,3''R,5R,5'R,6S,6''S,7aS)-2-(((tert-butyldiphenylsilyl)oxy)methyl)-6-methyl-3''-((triethylsilyl)oxy)dodecahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)methanol

methyl (E)-5-((2R,3aS,5R,5'R,6S,6''S,7aS)-2-(((tert-butyldiphenylsilyl)oxy)methyl)-6-methyl-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)-2-(phenylsulfonyl)pent-4-enoate

((2R,3aS,5R,5'R,6S,6''S,7aS)-2-formyl-6-methyl-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)methyl pivalate

(E)-5-((2R,3aS,3''R,5R,5'R,6S,6''S,7aS)-2-(((tert-butyldiphenylsilyl)oxy)methyl)-6-methyl-3''-((triethylsilyl)oxy)dodecahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)pent-4-en-1-yl pivalate

(E)-5-((2R,3aS,3''R,5R,5'R,6S,6''S,7aS)-2-(((tert-butyldiphenylsilyl)oxy)methyl)-3''-hydroxy-6-methyldodecahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)pent-4-en-1-yl pivalate

perfluorophenyl (2R,3aS,5R,5'R,6S,6''S,7aS)-6-methyl-6''-((pivaloyloxy)methyl)-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-2-carboxylate

((2R,3aS,3''R,5R,5'R,6S,6''S,7aS)-2-(((tert-butyldiphenylsilyl)oxy)methyl)-6-methyl-3''-((triethylsilyl)oxy)dodecahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)methyl pivalate

((2R,3aS,5R,5'R,6S,6''S,7aS)-2-(hydroxymethyl)-6-methyl-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)methyl pivalate

(E)-5-((2R,3aS,5R,5'R,6S,6''S,7aS)-2-(hydroxymethyl)-6-methyl-2,3,3a,3',4',5'',6,6'',7,7a-decahydrodispiro[furo[3,2-b]pyran-5,2'-furan-5',2''-pyran]-6''-yl)pent-4-en-1-yl pivalate