Purification, structural elucidation and bioactivity of tryptophan containing diketopiperazines, from Comamonas testosteroni associated with a rhabditid entomopathogenic nematode against major human-pathogenic bacteria

•Isolated five tryptophan containing cyclic dipeptideswere from Comamonas testosteroni associated with Rhabditis sp.•The compounds were identified as Cyclo-(L-Trp-L-Pro), Cyclo-(L-Trp-L-Tyr), Cyclo-(L-Trp-L-Ile), Cyclo-(L-Trp-L-Leu) and Cyclo-(L-Trp-L-Phe), respectively.•To our knowledge this is the...

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