The results of in vivo antibacterial activities of compound 27motived us to examine the pharmacokinetic properties of compound 27. The PK profile of compound 27 was measured in mice following intravenous (i.v.) administration at a dose of 10 mg/kg. The plasma concentration-versus-time curves were shown in Fig. 4, from which the PK parameters of compound 27 could be obtained by noncompartmental analysis (see Table 3).