2,6-Piperidinedicarboxylic acid, 4-(2-(2-carboxy-5-(beta-D-glucopyranosyloxy)-2,3-dihydro-6-hydroxy-1H-indol-1-yl)ethylidene)- 4-(2-(2-Carboxy-5-(beta-D-glucopyranosyloxy)-2,3-dihydro-6-hydroxy-1H-indol-1-yl)ethylidene)-2,6-piperidinedicarboxylic acid 78693-88-6