A method for obtaining N-azepan-2-ylidene-N’-phenylhydrazine hydrochloride, which exhibits antibacterial activity against Acinetobacter species Acinetobacter baumannii:

HCI in which an exothermic reaction is carried out by mixing equimolar amounts of 2-methoxy-3,4,5,6-tetrahydro-7H-azepine and phenylhydrazine hydrochloride, after which the mixture is crystallized from ethanol.