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Three new flavonol glycosides isolated from the 70% methanol extract of Suaeda maritima (Chenopodiaceae) were characterized based on spectroscopic and chemical methods as quercetin 3-O-α-l-rhamnopyranosyl(1″' → 6″)-β-d-galactopyranoside-7-O-β-d-glucopyranosyl(1″″' → 2″″)-glucopyranoside, kaempferol 3-O-α-l-rhamnopyranosyl(1″' → 6″)-β-d-galactopyranoside-7-O-β-d-glucopyranosyl(1″″' → 2″″)-glucopyranoside, and kaempferol 3-O-α-l-rhamnopyranosyl(1″' → 6″)-β-d-galactopyranoside-7-O-(2″″'-O-trans-feruloyl)-β-d-glucopyranosyl-(1″″' → 2″″)-β-d-glucopyranoside. In addition, four known compounds, namely, quercetin and kaempferol, methyl cis, trans-ferulate, and methyl trans-ferulate were identified. The plant extract and these compounds showed cytotoxic activity against the human tumor cell lines MCF7, HCT116, and HEPG2.