Hybrid Diterpenic Meroterpenoids from an Endophytic Penicillium sp. Induced by Chemical Epigenetic Manipulation

To determine the absolute configuration of chiral compounds, theoretical calculations of ECD spectra have been extensively carried out, where the shape of component CD Cotton effects was approximated by the Gaussian distribution curve. However, in some articles, errors are found in the equations of Gaussian curve expressing CD Cotton effects. In this short review, the correct and general forms of the Gaussian equation and the approximation of the CD curve by other methods are described. 2009 Wiley-Liss, Inc.