MOPAC7 originally is a work of James J. P. Stewart and co-workers. The MOPAC7 package used as a base for this work was obtained from ftp://esca.atomki.hu/mopac7/LINUX/mopac-7.01-4.tar.gz Changes made by Tommi Hassinen, University of Kuopio, Finland, April 2001. email <thassine@messi.uku.fi>