The invention relates to a configurational stereoisomer, referred to as enantiomer E3, of bromadiolone, having, as determined by the chromatographic analysis of a bromadiolone composition comprising four configurational stereoisomers of bromadiolone, carried out under conditions described hereinafter, a retention time t3 with a value such that t1 < t2 < t3 < t4; t1, t2 and t4 representing the retention times of the configurational stereoisomers of bromadiolone different from said enantiomer E3, said analysis being carried out at a temperature of 27.3°C.
