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Maraviroc is a CCR5 inhibitor approved in 2007 for treatment of therapy experienced adult patients infected with CCR5-tropic HIV-1 virus. International guidelines for HIV therapy indicate a plasma concentration cutoff of maraviroc for response. We developed and validated a new HPLC-MS method to quantify maraviroc concentrations in human plasma. 6,7-Dimethyl-2,3-di(2-pyridyl)quinoxaline was used as...