The invention relates to a composition comprising flocoumafen and an amount of a configurational stereoisomer, referred to as enantiomer E4, of flocoumafen, such that the ratio of this amount to the amount of flocoumafen in the composition is less than 10%, said enantiomer E4 being present to the exclusion of a racemic mixture, said enantiomer E4 having, as determined by the chromatographic analysis of flocoumafen, a retention time t4 with a value such that t1 < t2 < t3 < t4; t1, t2 and t3 representing the retention times of the configurational stereoisomers of flocoumafen different from said enantiomer E4, the chromatographic analysis being conducted at a temperature of 23.5°C.
