A highly sensitive lc-ms-ms assay for analysis of ciclophosphamide enantiomers in plasma: applications to pharmacokinetics in lupus nephritis patients - Silva, Carolina Miranda; Fernades, Bruno José Dumet; Silva, Lucienir Maria da; Donadi, Eduardo Antônio; Marques, Maria Paula; Lanchote, Vera Lúcia (International Congress of Pharmaceutical Sciences (CIFARP), 2007)