Disclosed is a configurational stereoisomer, referred to as enantiomer E2, of flocoumafen, the enantiomer E2 having, as determined by the chromatographic analysis of a flocoumafen composition including four configurational stereoisomers of flocoumafen, carried out under conditions described hereinafter, a retention time t2 with a value such that t1<；t2<；t3<；t4； t1, t3 and t4 representing the retention times of the configurational stereoisomers of flocoumafen different from the enantiomer E2, the chromatographic analysis being carried out at a temperature of 23.5° C.
