The 3-acyl precursor to
pseudopyronine A (7) was the only pyrone tested that exhibited
comparable antimycobacterial activity to the natural
products. In the parasitic assays, the majority of compounds
tested exhibited slightly more potent activity towards L. donovani
than towards the other parasites. In general, the compounds
appeared to be more toxic towards P388 leukaemia
cells than towards primary mammalian L6 cells.