The necessaries for treating a blood vessel include a tubular endoprosthesis whose distal end is connected to a support by releasable retaining means and a ferrule for guiding the endoprosthesis connected to the support for implanting it in a living organism. The compounds of formula I are BACE1 inhibitors useful for the treatment of, for example, Alzheimer’s Disease. The timing circuit includes a BJT coupled to the gate of the SCR.