A fuel injector for delivering fuel to a combustion chamber having a chamber ceiling, the fuel injector having a primary axis and able to control fuel delivery through a first outlet opening or together through both the first outlet opening and a second outlet opening. When the physician pulls a shutter the springs are sequentially released causing the staples to be fired. ; R3 is carbocyclic ring, heterocyclic ring; and a pharmaceutically acceptable salt thereof, a process for the preparation thereof, a pharmaceutical comprising them as an active ingredient. An elastomeric core is interposed between, and attached to, the mating surfaces of the first end plate and the second end plate.