1. Tokyo Research Institute; Seikagaku Kogyo Co., Ltd.; Higashiyamato Tokyo 189
2. Department of Measles Virus; National Institute of Health; Musashimurayama Tokyo 190-12
3. Chemical Instrument Center; Nagoya University; Chikusa-ku Nagoya, Aichi 464
4. Department of Chemistry; Nagoya University; Chikusa-ku Nagoya, Aichi 464