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Proanthocyanidins, which are characterized by the presence of two or more flavonoid units linked to each other only by either one 4->6, one 4->8, or one 8->8 CC-bond.
Bacterial terpenoids structurally characterized by a C30 skeleton, which is usually conjugated to a C5 (usually hydroxylated) unit linked by a carbon-carbon bond.
Compounds consisting of a (un-) substituted bactoprenyl group, which is a C-55 isoprenoid alcohol obtained by condensation of 10 unsaturated isoprene units a one saturated isoprene unit.
Potent cardiotoxic and neurotoxic alkaloids containing a C21-steroid backbone. They have been characterized from skin extracts of different frog species. The batrachotoxins have a homomorpholine ring at the steroidal CD-ring junction, a 3,9-hemiketal bridge and, in some cases, a 20beta-2,4-dialkylpyrrole-3-carboxylate moiety.