CYCLOPENTA[C]PYRAN-4-CARBOXYLIC ACID7-[[(4-CARBOXY-2,5-DIHYDROXYBENZOYL)OXY]- METHYL]-1-(?D-GLUCOPYRANOSYLOXY)-1,4A,5,6,7,- 7A-HEXAHYDRO-,(1S,4AS,7S,7AS)-