ЕР 0398425 A1, 22.11.1990. WO 2004/000789 A1, 31.12.2003. WO 2004/092117 A1, 28.12.2004. RU 2208610 C2, 20.07.2003. US 5789409 A, 04.08.1998. WO 95/00510 A1, (PFIZER INC, US), 05.01.1995. FRANK J. URBAN ET AL, synthetic communications, 26(8), 1996, p.p.1629-1638. MARIA L. LOPEZ-RODRIGES ET AL. Bioorganic & medicinal chemistry letters, 12, 2004,5181-5191. MARIA L.LOPEZ-RODRIGES ET AL. Bioorganic & medicinal chemistry letters, 13(19), 2003, 3177-3180.