“…Analytical methods for the determination of PIO in pharmaceutical dosages forms using HPLC [35] , [44] , [45] , [46] , [47] , [48] , [49] , [50] , [51] , [52] , [53] , [54] , [55] , [56] , [57] , [58] , [59] , [60] , [61] , [62] , [63] , [64] , [65] , [66] , [67] are shown in Table 3 , while Fig. 5 shows the best HPLC methods for the analysis of PIO.…”