(1S,3'R,4'S,5'S,6'R)-6-(4-ethylbenzyl)-6'-(hydroxymethyl)-3',4',5',6'-tetrahydro-3H-spiro[isobenzofuran-1,2'-pyran]-3',4',5'-triol; (1S,3'R,4'S,5'S,6'R)-6-[(4-Ethylphenyl)methyl]-3',4',5',6'-tetrahydro-6'-(hydroxymethyl)spiro[isobenzofuran-1(3H),2'-[2H]pyran]-3',4',5'-triol; CSG 452;