Acanthospermum australe 8beta hydroxy 9alpha (2 methylbutyryloxy) 14 oxo acanthospermolide 2 9alpha hydroxy 8beta (2 methylbutyryloxy) 14 oxo acanthospermolide 2 Acanthospermolides 2 Argentina 2 Gram positive bacterium 2 Melampolides 2 Posibacteria 2 Sesquiterpene lactones 2 acanthospermum australe extract 2 antimicrobial activity 2 article 2 artifact 2 drug isolation 2 drug structure 2 melampolide 2 nuclear magnetic resonance 2 plant extract 2 priority journal 2 shrub 2 unclassified drug 2 Caa-tay 1 Especies vegetales vasculares 1 Plantas medicinales 1 Polygonum hydropiperoides 1 Propiedades antiproliferativas 1 Tapekue 1 Tratamiento del cáncer 1