The present invention relates to a compound of formula (3Z,5S)-5-(hydroxymethyl)-1- [(2'-methyl-1,1'-biphenyl-4-yl)carbonyl]pyrrolidin-3-one O-meth19243yloxime, and/or an active metabolite thereof having antagonist action at the oxytocin receptor and/or vasopressin V1a receptor, to processes for their preparation, pharmaceutical compositions containing them and their use.