Quercetin 3-O-a-L-arabinopyranosid

Licania pittieri Prance is a tree up to 15 meters high growing in the cloud forests at 1800 m in altitude. From the methanol extract of the leaves, collected in the Parque Nacional Henry Pittieri, oleanolic acid (1), ursolic acid (2), catechin (3), epicatechin (4), quercetin (5), and four glycosidic derivatives, quercetin 3-O-P-D-galactopyranoside (6), quercetin 3-O-P-D-glucopyranoside (7), quercetin 3-O-a-L-rhamnopyranoside (8), and quercetin 3-O-a-L-arabinopyranoside (9) were identified directly by comparing their spectroscopic data with those reported in the literature and/or authentic samples [see Fig. (1)] [5]. 

Licania apetala var. apetala (E. May) Fritsch is a tree native to the Amazonian forest. Its leaves were extracted with the same method used for L. licaniaeflora. From the n-butanol extract of the leaves seven flavonoids were obtained quercetin 3-0- 3-D-galactopyranoside (6), quercetin 3-O-a-L-rhamnopyranoside (8) quercetin 3-O-rutinoside (18), quercetin 3-0-a-L-arabinopyranoside (9), taxifolin 3-O-a-L-rhamnopyranoside (64), myricetin 4 -O-a-L-rhamnopyranoside (66), and kaempferol 3-O-rutinoside (67), [see Fig. (1), (2), (7), and (8)] [18]. 

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