Phytochemical study on the methanolic extract of aerial parts this plant led to isolation 7 phenolic compounds (1-7), including 3 new ones (1-3). Their chemical structures were determined be (7,8- threo)-1 -O-β-D-[6′ -O-syringoylglucopyranosyl]-2-methoxy-7,8,9-trihydroxyphenylpropane (1), threo)-8 -O-(2′′-methoxyacetophenone-1′′-yl)-1 -O-β-D-glucopyranosyl-2-methoxy-7,9-dihydroxyphenylpropane (...

Two new flavonolignan glycosides, tricin-4'-O-(threo-β-guaiacylglyceryl) ether 7''-O-β-D-glucopyranose (4) and tricin-4'-O-(erythro-β-guaiacylglyceryl) ether 7''-O-β-D-glucopyranose (5) were isolated from the roots of Zizania latifolia, together with tricin-7-O-β-D-glucopyranose (1), tricin-4'-O-(threo-β-guaiacylglyceryl) ether 7-O-β-D-glucopyranose (2), and tricin-4'-O-(erythro-β-guaiacylglyce...

Three new docetaxel prodrugs, i.e., 7-propionyldocetaxel 3''-O-β-D-glycopyranosides, which contain ester-linked monosaccharides, were synthesized by a chemo-enzymatic procedure involving enzymatic transglycosylations with lactase, β-galactosidase, or β-xylosidase. The water-solubility of 7-propionyldocetaxel 3''-O-β-D-glucopyranoside was 52-fold higher than that of docetaxel. 7-Propionyldocetax...

Three novel triterpene glycosides (1 – 3), namely lycicoside I, II and cilicicoside I, were isolated from two different Cephalaria (Dipsacaceae) species along with one known oleananeand one iridoit-type of glycoside. The structures of these compounds were established as 3-O-[β -D-glucopyranosyl(1→3)-α-L-rhamnopyranosyl(1→4)-β -D-xylopyranosyl(1→4)-β -D-xylopyranosyl]-28-O-[β -Dglucopyranosyl(1→...

Three new steroidal glycosides, cyanoauriculosides F, G and H (1-3), were isolated from the roots of Cynanchum auriculatum (Asclepiadaceae) along with two known steroidal derivatives. On the basis of spectroscopic analysis and chemical methods, their structures were identified as 20-O-acetyl-8,14-seco-penupogenin-8-one 3-O-α-L-cymaropyranosyl-(1→4)-β-D-cymaropyranosyl-(1→4)-α-L-diginopyranosyl-...

Two new bidesmoside triterpenoid saponins which were identifed as 28-O-β-D-xylopyranosyl(1→3)-β-D-xylopyranosyl(1→4)-α-L-rhamnopyranosyl(1→2)-[α-L-rhamno-pyranosyl(1→3)]-β-D-fucopyranosyl gypsogenin 3-O-β-D-glucopyranosyl (1→2)-β-D-glucopyranosiduronic acid (C1) and 28-O-β-D-xylopyranosyl(1→4)-α-L-rhamnopyranosyl (1→2)-[α-L-rhamnopyranosyl(1→3)]-β-D-fucopyranosyl gypsogenin 3-O-β-D-gluco-pyrano...

Let G = (V, E) be a simple graph with vertex set V and edge set E. Let D be a subset of V, and let B(D) be the set of neighbours of D in V \ D. The differential ∂(D) of D is defined as |B(D)| − |D|. The maximum value of ∂(D) taken over all subsets D ⊆ V is the differential ∂(G) of G. For β ∈ (−1, ∆), the β-differential ∂β(G) of G is the maximum value of {|B(D)| − β|D| : D ⊆ V}. Motivated by an ...

Bioassay-guided fractionation of a CH(2)Cl(2)-MeOH extract of the aerial parts of Albizia inundata resulted in the isolation of two new natural oleanane-type triterpene saponins {3-O-[α-L-arabinopyranosyl(1→6)]-2-acetamido-2-deoxy-β-D-glucopyranosyl oleanolic acid (1) and 3-O-[α-L-arabinopyranosyl(1→2)-α-L-arabinopyranosyl(1→6)]-2-acetamido-2-deoxy-β-D-glucopyranosyl acacic acid lactone (2)} al...