1. Laboratory of Synthetic and Medicinal Chemistry; Faculty of Pharmaceutical Sciences; Tohoku Medical and Pharmaceutical University; 4-4-1 Komatsushima, Aoba-ku 981-8558 Sendai Japan
2. Department of Clinical Oncology, Institute of Development, Aging and Cancer; Tohoku University; 4-1 Seiryomachi, Aoba-ku 980-8575 Sendai Japan