Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan, Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark, Department of Chemical Sciences, Tezpur University, Napaam, Tezpur 784028, Assam, India, and Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan (2008-10-23時点)