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APCI-MS and 1H-NMR spectra of the anti-Staphylococcus compounds (IN-1 and IN-2) purified from the EA-extract of indigo naturalis; (A) APCI-mass spectrum of the compound IN-1; (B) APCI-mass spectrum of the compound IN-2; (C) 1H-NMR spectrum of the compound IN-1 (400 MHz, acetone-d6); (D) 1H-NMR spectrum of the compound IN-2 (400 MHz, acetone-d6).
