Ingenamine G and cyclostellettamines G-I, K, and L from the new Brazilian species of marine sponge Pachychalina sp.
de Oliveira JH, Grube A, Köck M, Berlinck RG, Macedo ML, Ferreira AG, Hajdu E.
The chemical investigation of the cytotoxic and antituberculosis active MeOH crude extract of the marine sponge Pachychalina sp. led to the isolation of six new nitrogenous metabolites, including ingenamine G (1), as well as a mixture of new cyclostellettamines G, H, I, K, and L (10-14) with the known cyclostellettamines A-F (4-9). Structural assignments of compound 1 were based on the analysis of MS and NMR data, while the structures of compounds 10-14 could be established by HPLC-MS/MS analysis. Ingenamine G displayed cytotoxic activity against HCT-8 (colon), B16 (leukemia), and MCF-7 (breast) cancer cell lines, antibacterial activity against Staphylococcus aureus (ATCC 25923), Escherichia coli (ATCC 25922), and four oxacilin-resistant S. aureus strains, and antimycobacterial activity against Mycobacterium tuberculosis H37Rv.