Antimicrobial activities of xinghaiamine A (MIC, µM) against the test strains.

a MIC represented the lowest compound concentration apparently inhibiting microorganism growth. b Xinghaiamine A was dissolved in MeOH for MIC test and MeOH was used as the negative control. c Tetracycline and vancomycin were employed as positive controls for the pathogenic bacteria (S. aureus, B. subtilis, E. coli, A. baumanii and P. aeruginosa) and clinical MRSA isolates (5301, 5438 and 5885), respectively. d “−” indicated that the positive control was not measured for the test strains.