1,1'-(4,4,8,8-tetramethyl-4,8 diazaundecamethylene)-(4-(3-(benzyl-2,3-dihydro-2-(3H)-benzothiazolydidene)methyl)quinolinium)-(4-(3-methyl-2,3-dihydro-2(3H)-benzothiazolylidene)-methyl quinolinium)tetraoidide