The present invention relates to a pharmaceutical composition comprising at least one compound of formula whereinR1 denotes e. Disposed from and into the ignition housing are at least two connecting leads that arc connected to conductors that also arc connected to contact lugs. When a current image is received, a latest background image is established by referring to the current image and the M images previous to the current image, so as to update one of N background images, wherein M and N are positive integers.