Described herein are compositions and compounds of formula I, and their use in the treatment andor prevention of diseases and disorders. The bracket has a detachable body having a mounting surface adapted to receive a license plate, two arms that attach to the body and extend from the rear of the body. Two discrete electronic sub-assemblies, for example PCBs, can be mechanically and electrically connected without the need for a gender male connector on one PCB and a corresponding gender female connector on the other PCB. The presence of these ions in the lasing gas facilitates ignition of a gas discharge between the slab electrodes for energizing the laser.