New Cyclopeptide and γ‑Butyrolactone Derivatives from an Endophytic Strain of Cophinforma mamane

From an endophytic strain of Cophinforma mamane isolated from the leaves of Bixa orellana, a previously undescribed γ-butyrolactone compound (2) and three new cyclopentapeptides (3-5) have been isolated from the same strain, along with the known (4R)-striatisporolide A (1). Their structures were elucidated through extensive spectral analysis and DP4+ calculations. The two γ-butyrolactone derivatives (1, 2) exhibited moderate inhibitory activity against axenic Leishmania infantum amastigotes (IC₅₀ = 13.33 and 4.43 μM, respectively), while only compound 2 displayed cytotoxic activity on Jurkat cells (17% growth inhibition at 1 μg/mL) and weak antibacterial activity against Enterococcus faecalis (MIC = 64 μg/mL).