A quinoxalinone-bohemamine hybrid compound quinohemanine (1), together with 1-methyl-2(H)-quinoxalin-2-one (2), was isolated from Streptomyces sp. CPCC 200497, a producer of quinomycins and bohemamines. Compounds 1 and 2 were purified using standard chromatographic methods, and their structures were defined through interpretation of HRMS, 1D, and 2D NMR data. Both 1 and 2 displayed moderate cytotoxicity against cancer cell line HepG2.
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The authors would like to thank Nuclear Magnetic Resonance Center (Institute of Materia Medica, CAMS & PUMC) and Analytical Center of Drugs (Institute of Medicinal Biotechnology, CAMS & PUMC) for the NMR, MS and CD analyses. This work was supported by CAMS Initiative for Innovative Medicine (CAMS-I2M-1-012), and National Infrastructure of Microbial Resources (No. NIMR-2018-3).
Conflict of interest
The authors declare that they have no conflict of interest.