The invention relates to a configurational stereoisomer, referred to as enantiomer E2, of flocoumafen, said enantiomer E2 having, as determined by the chromatographic analysis of a flocoumafen composition comprising 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 said enantiomer E2, said chromatographic analysis being carried out at a temperature of 23.5°C.
