Disclosed is a configurational stereoisomer, named enantiomer E3, of bromadiolone having, by chromatographic analysis of a bromadiolone composition including four configurational stereoisomers of bromadiolone performed under the conditions described hereinbelow, a retention time t3 having a value such that t1<；t2<；t3<；t4； t1, t2 and t4 being the retention times of the configurational stereoisomers of bromadiolone different from the enantiomer E3, the analysis being performed at a temperature of 27.3° C.
