Figure S1. UV and ESI-MS spectra of SEK15b (3, a), chromomycin A3 (1, b) and chromomycin A2 (2, c). Table S1. The 1H (300 MHz) and 13C NMR (75 MHz) data for SEK15b (3) (DMSO-d 6 , δ in ppm, J in Hz). Table S2. The 1H NMR (300 MHz) data for chromomycins A3 (1) and A2 (2) (CDCl3, δ in ppm, J in Hz). (DOCX 200 kb