Streptomycindole, an Indole Alkaloid from a Marine Streptomyces sp. DA22 Associated with South China Sea Sponge Craniella australiensis

A new indole alkaloid, streptomycindole (1), and a known related compound, N‐phenylacetyl‐L‐tryptophan (2), have been isolated from Streptomyces sp. DA22, associated with South China Sea sponge Craniella australiensis. Their structures were established on the basis of a combination of mass spectrometry, 1H‐ and 13C‐NMR spectroscopic analyses, and chemical methods.