Photochromism and structural chemistry of benzo[1,2,3-kl:4,5,6-k\u27l\u27]dixanthene and its analogues

Copyright 1994 Society of Computer Chemistry,Japan.This paper was published in "Sumio. Tokita, J.Comput. Chem. Jpn., 2(1), ,1994. The internet address of the above Journal is as follows: http://www.sccj.net