It is an object of the present invention to provide a semiconductor integrated circuit having a chip layout that reduces line length to achieve faster processing. Compounds of the invention are nucleic acid-based and preferably comprise 2, 3, 4, 5 or 6 nucleoside units. The chemical reactions are exemplified by exciting one or several label compounds into an excited state which is spontaneously de-excited by emission of ultraviolet, visible or infrared light, in aqueous solution.