Title: Tsutomu M, et, al. The Novel CXCR4 Antagonist KRH-3955 Is an Orally Bioavailable and Extremely Potent Inhibitor of Human Immunodeficiency Virus Type 1 Infection: Comparative Studies With AMD3100. Antimicrob Agents Chemother. 2009 Jul; 53(7): 2940-8.