In a further aspect, the present invention provides candesartan cilexetil substantially free of {HEAD ~ 2 oxo impurities} of {TAIL ~ structural formula} : 
In a further aspect , the present invention provides candesartan cilexetil substantially free of { HEAD ~ 2 oxo impurities } of { TAIL ~ structural formula } :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH