Background
Structure elucidation of unknown small molecules by mass spectrometry is a challenge despite advances in instrumentation. The first crucial step is to obtain correct elemental compositions. In order to automatically constrain the thousands of possible candidate structures, rules need to be developed to select the most likely and chemically correct molecular formulas.

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Seven Golden Rules for heuristic filtering of molecular formulas obtained by accurate mass spectrometry

A diverse array of biologically active, lipid-soluble alkaloids have been discovered in amphibian skin. Such alkaloids include the following:  the steroidal samandarines from salamanders, the batrachotoxins, histrionicotoxins, gephyrotoxins, and epibatidine from neotropical poison frogs (Dendrobatidae), the pumiliotoxins, allopumiliotoxins, homopumiliotoxins, and decahydroquinolines from certain genera of anurans from four families (Dendrobatidae, Mantellidae, Bufonidae, and Myobatrachidae), a variety of izidines (pyrrolizidines, indolizidines, quinolizidines, lehmizidines), pyrrolidines, piperidines, various tricyclics (related in structures to the coccinellines), and spiropyrrolizidines from the first three of these four families, the pseudophrynamines from one genus of Australian frogs, and a variety of unclassified alkaloids as yet of undetermined structure. With the exception of the samandarines and the pseudophrynamines, all alkaloids appear to be derived from dietary sources. Although only a few of...

Alkaloids from amphibian skin: a tabulation of over eight-hundred compounds.

Biosynthesis and metabolism of cyclopropane rings in natural compounds.

ENCORE: the effect of nutrient enrichment on coral reefs. Synthesis of results and conclusions.

Dendral and meta-dendral: their applications dimension

Terpenoids from Coelenterates

Demonstration of a biogenetically unprecedented side chain in the marine sterol, gorgosterol

Thirty-one species of soft corals have been found on a 30×20 m quadrat on the sheltered shore of Laing Island, on the north coast of Papua New Guinea. Their contribution to the living coverage has been quantified, with special attention to zonation. The observed distribution patterns are discussed and the importance of vegetative propagation for some of the species is stressed.

The soft coral community on a sheltered reef quadrat at Laing Island (Papua New Guinea)

Chemical studies of marine invertebrates. IV. Terpenoids LXII. Eunicellin, a diterpenoid of the gorgonian . X-ray diffraction analysis of Eunicellin dibromide.

A defense alkaloid in a carnivorous beetle

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