Keywords: Piericidin A.svg Skeletal formula of piericidin A Created using http //www acdlabs com/download/chemsk html ACD/ChemSketch 8 0 and http //www inkscape org Inkscape Own 2007-04-29 Fvasconcellos 17 48 29 April 2007 UTC Ethers Ketones Nitrogen heterocycles 4-Pyridones |