New prodrugs and analogs of the phenazine 5,10-dioxide natural products iodinin and myxin promote selective cytotoxicity towards human acute myeloid leukemia cells† † Electronic supplementary information (ESI) available: Synthetic procedures, characterization data, NMR spectra, detailed results from PAMPA assay, KPLS-data. See DOI: 10.1039/d1md00020a