Disclosed is a configurational stereoisomer, referred to as enantiomer E4, of bromadiolone, having, as determined by the chromatographic analysis carried out under conditions described hereinafter, a retention time t4 with a value such that t1<；t2<；t3<；t4； t1, t2 and t3 representing the retention times of each configurational stereoisomer of bromadiolone different from the enantiomer E4, the analysis being carried out at a temperature of 27.3° C.
