oxopropaline
{{more footnotes|date=September 2013}}
Oxopropalines are novel cytocidal beta-carbolines isolated from Streptomyces.{{cite journal|vauthors=Abe N, Nakakita Y, Nakamura T, Enoki N, Uchida H, Takeo S, Munekata M |year=1993|title=Novel cytocidal compounds, oxopropalines from Streptomyces sp. G324 producing lavendamycin. I. Taxonomy of the producing organism, fermentation, isolation and biological activities|volume=46|issue=11|pages=1672–1677|pmid=8270488|journal=J. Antibiot.|doi=10.7164/antibiotics.46.1672|doi-access=free}}