137 L 137-L 3,4',7-Trihydroxyflavanone-3-di-D-hexuronic acid methyl ester 3,4-Dihydro-7-hydroxy-2-(4-hydroxyphenyl)-4-oxo-2H-1-benzopyran-3-yl O-(6-methyl-D-hexuronosyl)-D-hexosiduronic acid, methyl ester 53923-02-7