Anonazepine, a new alkaloid from the leaves of (Annonaceae).

From the CHCl-soluble extract of L. (Annonaceae) leaves, one new 3-benzazepine-type alkaloid, anonazepine (), and four known aporphine-type alkaloids, (+)-laurotetanine (), (+)-norglaucine (), (-)-xylopine (), and lanuginosine (), were isolated. Except for (-)-xylopine (), these remaining known alkaloids were first reported in .

Pipercyclobutanamide D, a new member of the cyclobutanamide-type alkaloid, from the roots of .

From the EtOH-soluble extract of the roots of , one new dimeric alkamide, pipercyclobutanamide D () was isolated. Its structure was elucidated on the basis of NMR spectroscopic interpretation. The relative configuration of was determined based on the NOESY analysis.

Synthesis, α-glucosidase inhibition, and molecular docking studies of novel N-substituted hydrazide derivatives of atranorin as antidiabetic agents.

A series of novel N-substituted hydrazide derivatives were synthesized by reacting atranorin, a compound with a natural depside structure (1), with a range of hydrazines. The natural product and 12 new analogues (2-13) were investigated for inhibition of α-glucosidase. The N-substituted hydrazide derivatives showed more potent inhibition than the original.

Two new sesquiterpenes from the stems of .

From the ethyl acetate extract of the stems of , seven compounds (-) were isolated, including two new compounds such as mivelutina A acid (), mivelutina B acid () and one known compound mivelutina B methyl ester (). For this NMR data were not known previously. Their relative structures were elucidated based on NMR spectroscopic analysis.

A new furanochromone from the leaves of .

Phytochemical study on the EtOAc-soluble extract of the leaves of led to the isolation of a new furanochromone, 6,8-dihydroxy-2-methyl-9-furo[3,2-]chromen-9-one (), along with four known compounds (-). Their structures were elucidated based on the basis of the spectral interpretation. The plausible biosynthesis pathway for the formation of the new furanochromone was proposed.

A new lignan from the flowers of L. (Malvaceae).

From MeOH-soluble fraction of the flowers of (Malvaceae), one new lignan, (+)-4--methyl-5'-methoxy-secoisolariciresinol (), together with four known compounds (-) were isolated. The structures were elucidated based on NMR spectroscopic analysis. The absolute configuration of was determined based on the Cotton effects in the CD spectrum.

Structural studies of the chemical constituents of Tithonia tagetiflora Desv. (Asteraceae).

Tithonia tagetiflora Desv. (Asteraceae) is a widespread plant in Vietnam, and the species of Tithonia are known as plants containing many biologically active compounds. However, T.