Patent ID: 7446202

Claim:
A compound having the formula: wherein W represents the atoms necessary to form a phenyl ring or one or two unsubstituted 5- or 6-membered aromatic rings; R 2 is a substituted alkyl, unsubstituted alkyl, substituted arylalkyl, unsubstituted arylalkyl, substituted heteroalkyl, unsubstituted heteroalkyl, alkoxy, carboxy, carboxyalkyl, hydroxy, hydroxyalkyl, sulfo, sulfoalkyl, amino, aminoalkyl, alkylamino, dialkylamino, or trialkylammonium; α is 0 or 1; n is 0 or 1; X is O or S; D is a substituted quinolinium, or unsubstituted quinolinium moiety; with the proviso that the compound is substituted by at least one negatively charged moiety at a physiological pH.