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Geobarrettin D (
), a new bromoindole alkaloid, was isolated from the marine sponge
collected from Icelandic waters. Its structure was elucidated by 1D, and 2D NMR (including
H-
N HSQC,
H-
N HMBC spectra), as well as HRESIMS data. Geobarrettin D (
) is a new 6-bromoindole featuring an unusual purinium herbipoline moiety. Geobarrettin D (
) decreased secretion of the pro-inflammatory cytokine IL-12p40 by human monocyte derived dendritic cells, without affecting secretion of the anti-inflammatory cytokine IL-10. Thus, compound
shows anti-inflammatory activity.