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Dichocetide D Structure Elucidation

Shaker et al. recently reported the isolation of Dichocetide D from the marine fungus Dichotomomyces cejpii under oxygen stress conditions. The structure of Dichocetide D was revised by Elyashberg et al on the basis of chemical considerations and utilization of ACD/Structure Elucidator.

El-Elimat et al reported five new and one known meroterpenoids, including the discovery of a novel ioxa[4.3.3]propellane metabolite neosetophomone A that incorporates a 3-methyl-2,3-dihydrofuran bridge into a 5,6 tricyclic 2-hydroxycyclopent-2-en-1-one/tetrahydropyran ring system, molecular formula C24H32O5.

A series of new phenazines were isolated and their structures elucidated; one of these compounds was Dermacozine O, with a molecular formula of C23H15O4N3.

E. Ioannou et al have developed an integrated metabolomic platform for the identification of known compounds and detection of new metabolites at the early stages of phytochemical analysis. Vagiallene was isolated through a series of chromatographic separations, molecular formula C15H15Br2O5.

Isatisindigoticanine I Ban Lan Gen, Isatis tinctoria L. (synonym Isatis indigotica Fort.), of the Brassicacene family, is a biennial herbaceous plant. It is widely cultivated and distributed in China, where its roots are used in Traditional Chinese Medicine (TCM) for the treatment of many diseases. Ban Lan Gen was studied, and a series of alkaloids...

Trichilianone D Trichilia species, a genus of plants from the Meliaceae family, are found in tropical forests and are used in traditional medicine. This species is poorly investigated and so a phytochemical study was published just recently [1]. This included the isolation of metabolites and the testing for antileishmanial activity. The study was focused on...

Asperspiropene A was first reported by He et al as the second derivative of a class of compounds containing a unique six-membered ring substructure. The molecular formula was determined from the HR-MS spectrum to be C17H26O8.

A rich source of cembrane-type metabolites has been found to be Lobophytum crassum, a soft coral from the family of Alcyoniidae. Among five new cembrane derivatives that were isolated is Lobocrassin A, molecular formula C20H29ClO4.

Without correctly identifying the molecular ion on a mass spectrum, the nitrogen rule generally cannot be applied to any arbitrary ion peak. The chemical structure for N-[(1E)-1-phenylethylidene]methanamine and its EI mass spectrum are shown below. As expected, the odd value for the molecular ion at m/z 133 dictates an odd number of nitrogen atoms. However,...