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Tambjamine
Tambjamines are a group of natural products that are structurally related to prodiginines and are characterized by a 4-methoxy-2,2'-bipyrrolenamine structure. Tambjamines are composed of two pyrrole rings with an enamine moiety at C-5 and a methoxy group at C-4, and the majority have short alkyl chains substituted for the enamine nitrogen. This group of alkaloids have been isolated from marine invertebrates and bacteria (both marine and terrestrial). == Marine sources and ecological roles == The large nudibranch ''Roboastra tigris'' is a known predator of ''Tambje eliora'' and ''Tambje abdere'', two species of smaller nudibranchs. The chemical extracts of all three nudibranch species contain tambjamines, which were traced to ''Sessibugula translucens'', a food source of the two prey species. It is hypothesized that tambjamines are a chemical defense mechanism of the bryozoan against feeding by the spotted kelpfish ''Gibbonsia elegans''.
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