2-Bromo-1,6,6-trimethyl-6,7,8,9-tetra-hydro-phenanthro[1,2-b]furan-10,11-dione.

In the title compound, C19H17BrO3, the ring skeleton is located on a crystallographic mirror plane; two C atoms of the cyclo-hexene ring are disordered over the two locations to satisfy the preferred ring conformation. In the crystal, C-H⋯O hydrogen bonds link the mol-ecules into chains along the a axis. π-π stacking inter-actions between benzo-quinone rings, with a centroid-centroid distance of 3.7225 (4) Å, are also observed, which connect the chains into a two-dimensional networkparallel to the ab plane.

Isolation and identification of antibacterial neo-compounds from the red ants of ChangBai Mountain, Tetramorium sp.

Three novel coumarin compounds along with two known amide alkaloids were isolated from a methanol extract of the red ants of ChangBai Mountain, Tetramorium sp. Their structures were identified on the basis of IR, 2D NMR ((1)H-(1)H COSY, HSQC, HMBC and NOESY) and HRESIMS analysis. Antibacterial activity of all the compounds was evaluated using KB paper diffusion through measurement of inhibiting zone. It was found that four of all the compounds exhibited significant inhibitory activity against Gram-positive bacteria Bacillus subtilis with MIC values of 25 µg/ml (compounds 1-3) and 15 µg/ml (compound 4).

Secondary metabolites from the roots of Phlomis umbrosa.

The phytochemical study of the roots of Phlomis umbrosa Turcz afforded a new phenylethanoid glycoside, 3-hydroxy-4-methoxy-ß-phenylethoxy-O-[2,3-diacetyl-α-l-rhamnopyranosyl-(1 â†’ 3)]-4-O-cis-feruloyl-[ß-d-apiofuranosyl-(1 â†’ 6)]-ß-d-glucopyranoside (1), and two new 28-noroleanane-derived spirocyclic triterpenoids, phlomishexaol C (2) and phlomishexaol D (3). Their structures were elucidated on the basis of 1D and 2D NMR analyses, in combination with high-resolution MS experiment.

[Studies on the chemical constituents of the flowers of Bupleurum chinese].

OBJECTIVE: To study the chemical constituents of the flowers of Bupleurum chinese. METHODS: The compounds were separated by column chromatography with silica gel. Their structures were identified by spectral methods and chemical analysis. RESULTS: Five compounds were isolated and identified as 8-(3',6'-dimethoxy)-4,5-cyclohexadiene-(delta11,12-dioxide-methylene) -dense-dihydrogen-isocoumarin(I), quercetin(II), rutin(III), calcifenol (IV), isorhamnetin (V). CONCLUSION: Compounds I and IV are obtained from the genus for the first time. Compound I is a new compound.

Phenylethanoid glycosides from the roots of Phlomis umbrosa.

The phytochemical study of the roots of Phlomis umbrosa Turcz. afforded three new phenylethanoid glycosides, 3'''-acetyl-O-betonyoside D (1), 2''', 3'''-di-acetyl-O- betonyoside D (2), and 3''', 4'''-di-acetyl-O-betonyoside D (3), along with five known phenylethanoid glycosides. Their structures were elucidated on the basis of spectroscopic data. The antitumor activity of the isolated compounds was investigated.

A novel oligosaccharide ester from Syringa pubescens.

Pubescenside A (1), a novel oligosaccharide ester, has been isolated from the flowers of Syringa pubescens, together with five known compounds D-mannitol (2), meso-inositol (3), hydrostytosol (4), glucose (5), and sucrose (6). The structure of 1 was elucidated as 1-O-[beta-D-glucopyranosyl-(1-6)-beta-D-galactopyranosyl-(1-1)-beta-D-galactopyranosyl-6]-4,4-dimethylpelargonicate by chemical and spectroscopic means. The water extract of the flowers and leaves of S. pubescens showed cytotoxicity against L2215 cell line (IC(50)=78 microg/ml).

[Inhibitory effect on male mouse procreation and chemical composition analysis of Rhynchosia volubilis ethyl acetate extract].

OBJECTIVE: To study the effect of Rhynchosia volubilis Lour ethyl acetate extract (RVLEAE) on male mouse procreation and analyse their chemical composition. METHOD: With the method of solvent extraction, RVLEAE was extracted and concentrated. In the experiment of mice, 80 male mice were randomly and equally divided into four groups: Normal Saline control, positive control with 0.1% triperygium wilfordii glycoside, 100 mg x kg(-1) x d(-1) RVLEAE and 400 mg x kg(-1) x d(-1) RVLEAE. Every mouse was fed with drug 0.01 mL x g(-1), once a day, ig, for eleven consecutive weeks. After two and 10 weeks, male and female mouse naturally mated for one week. The pregnancy rate, number of fetus and nonviable fetus, the viability of spermatozoon in the epididymis cauda, pathological change of testis and epididymis were observed in this experiment. In the analysis of chemical composition, RVLEAE were separated with column chromatography, and chemical compositions were identified with thinlayer chromatography, infrared chromatography and nuclear magnetic resonance. RESULT: The pregnancy rate of mice was markedly decreased. The number and viability of spermatozoon were slightly reduced in I and II after two and 10 weeks, but the pathological changes of testis and epididymis were markedly occurred. Main chemical compositions were identified as saccharide, glycosides especially analog of fucose, alcohols, and phenols. CONCLUSION: RVLEAE can inhibit the procreation of male mice, and inhibitory target tissue may be the epididymis. Active mechanism of RVLEAE may be that glycosides interfere the maturation of spermatozoon in the epididymis cauda.