Cavit Uyanik is Professor of Chemistry at Kocaeli University in Turkey. His research interests are in steroid and natural product chemistry. He has published more than 30 papers, and he is a former research student of Professor Hanson. James Hanson is Emeritus Research Professor in the University of Sussex. His research interests include thechemistry and biosynthesis of natural products particularly terpenoids, steroids and fungal metabolites. Over the past 50 years he has published over 500 papers and reviews and 12 books.