Abstract: A compound of formula (I) wherein R and R2 and the attached nitrogen atom form pyrrolidinyl or piperidinyl. R1 is a group of formula (II). R3 and R?3 are hydrogen, deuterium or halogen. R4, R5 and R10 are independently of each other hydrogen or alkyl. R6, R7 and R8 are hydrogen or deuterium. R9 is amino, alkyl, aryl, heterocyclyl or mercapto. If X is oxygen, R9 is additionally hydrogen; R?10 is alkyl, X is sulphur, oxygen, NR10, or N+(R?10)2; Y is sulphur or oxygen, and m is 0, 1 or 2, with the proviso that, when R and R2 and the attached nitrogen atom form piperidinyl, m is O, Y is S and Y is attached in position 3 of the piperidine ring, that group of formula (I) which is attached to the piperidine ring via the residue Y is either in the (S)-configuration or in the (R)-configuration, preferably in the (S)-configuration which is useful as antimicrobial, antibacterial.