The invention relates to new heterocyclic compounds of general formula, and their salts with a base or an acid:The invention also relates to a process for the preparation of these compounds as well as their use as medicaments, in particular as anti-bacterial agents. This invention further relates to the related kit of hydraulic accessories and to the related hydraulic system, as well as to a mixing apparatus comprising such hydraulic system. The coin mechanism increases the overall height by approximately 132 inches and prevents operation of the dispenser unless an appropriate coin or coins are first inserted into a coin slot. One or more tracking devices can be the associated with the patient and with guiding instruments for tracking guiding devices relative to the patient.