Quercitin structure

Steiner RA, KH KaUc, BW Dijkstra (2002) Anaerobic enzyme substrate structures provide insight into the reaction mechanism of the copper-dependent quercitin 2,3-dioxygenase. Proc Natl Acad USA 99 16625-16630. 

Catechin is among the principal polyphenolic monomers in white fir and western hemlock barks (10 JJLtJ ) Quercitin occurs in ponderosa pine bark, while dihydroquercitin is found in Douglas fir bark (16 17). The structure of these compounds are as follows ... 

FIGURE 24.13 MS spectra of quercitin 3-0-rhamnosyldiglucoside-7-0-rhamnoside (molecular weight [MW] = 918) from the leaves of Arabidopsis thaliana registered in the targeted positive-ion mode the structure of this compound was established earlier after NMR analysis (reproduced from Reference [85]). 

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