1. a Shemyakin Institute of Bioorganic Chemistry , ul. Miklukho-Maklaya 16/10, Moscow 117871, Russia
2. b Chumakov Institute of Poliomyelitis and Viral Encephalitides , Moscow 142 782, Russia
3. c Nutritional Foods Division , Taiyo Kagaku Co., Ltd. , 9-5 Akahori Shinmachi, Yokkaichi, Mie 510-0825, Japan
4. d Shemyakin Institute of Bioorganic Chemistry , ul. Miklukho-Maklaya 16/10, Moscow 117871, Russia