((1S,4'S,5'R,6'R)-4',5'-bis((tert-butyldimethylsilyl)oxy)-5,7-dimethoxy-3'-oxo-3',4',5',6'-tetrahydro-3H-spiro[isobenzofuran-1,2'-pyran]-6'-yl)methyl pivalate

((1S,3'R,4'S,5'S,6'R)-5'-((tert-butyldimethylsilyl)oxy)-3',4'-dihydroxy-5,7-dimethoxy-3',4',5',6'-tetrahydro-3H-spiro[isobenzofuran-1,2'-pyran]-6'-yl)methyl pivalate

(1S,4'S,5'R,6'R)-4',5'-bis((tert-butyldimethylsilyl)oxy)-6'-(hydroxymethyl)-5,7-dimethoxy-5',6'-dihydro-3H-spiro[isobenzofuran-1,2'-pyran]-3'(4'H)-one

((1R,6'R)-5,7-dimethoxy-5'-oxo-5',6'-dihydro-3H-spiro[isobenzofuran-1,2'-pyran]-6'-yl)methyl pivalate

((1R,5'S,6'R)-5'-((tert-butyldimethylsilyl)oxy)-5,7-dimethoxy-5',6'-dihydro-3H-spiro[isobenzofuran-1,2'-pyran]-6'-yl)methyl pivalate