Stilbenes, phenanthrenes and antiproliferative activity of .

The phytochemical study of (Orchidaceae) led to the isolation of two new stilbenoids and one new 9,10-dihydrophenanthrene, 4',5-dihydroxy-2',3-dimethoxy-dihydrostilbene (), 3,6'-dihydroxy-4'-methoxy-dihydrostilbene () and 1,2,6-trihydroxy-3,8-dimethoxy-9,10-dihydrophenanthrene (), named cattleymediol, cattleyol and phenanmediol, respectively, in addition to other five known compounds (). The structural elucidations of the isolated compounds were carried out through the analyses of the one-dimensional H,³C and NOE NMR spectra, and the 2D HSQC, HMBC, COSY and NOESY spectra, besides high-resolution mass spectrometry. In addition to this, the crude extract and its main fractions were analysed by ultra-high performance liquid chromatography coupled to high resolution mass spectrometry (UHPLC-QTOF-MS/MS), leading to the putative identification of several other compounds, including flavonoids and organic acids derivatives.

Reduction of Weed Growth under the Influence of Extracts and Metabolites Isolated from spp.

Weeds pose a problem, infesting areas and imposing competition and harvesting difficulties in agricultural systems. Studies that provide the use of alternative methods for weed control, in order to minimize negative impacts on the environment, have intensified. Native flora represents a source of unexplored metabolites with multiple applications, such as bioherbicides.