Patent ID: 7998935

Claim:
A semisquaraine of Formula 1 wherein X=H, I, Br, NO 2 , CN, COOH, SO 3 H or OR 1 , wherein R 1 =H, alkyl group having from 1 to 6 carbon atoms, glycol having from 2 to 4 ethylene group, cholic acid, cholesterol, sugar, amino acid or peptide, Y=H, I, or Br, Z=H, I, Br, NO 2 , CN, COOH, SO 3 H, SO 2 Cl or OR 1 and R 2 =alkyl group having from 1 to 6 carbon atoms, glycol having from 2 to 4 ethylene group, alkyl sulphonic acid or acid chloride having from 1 to 6 carbon atoms with a proviso that when R 2 =CH 3 , Z is not H.