12764-74-8 20283-46-9 2748-76-7 2H-1-Benzopyran-3,4,5,7-tetrol, 3,4-dihydro-2-(3,4,5-trihydroxyphenyl)- (VAN) 491-52-1 55068-67-2 Leucodelphinidin Leucoefdin Leucoephdine Leukoefdin Leukoephdin