US 2007/0179263 A 1  6  Aug. 2, 2007  hetero atom forming the functional group Y ( cation portion)  may constitute the aromatic ring at the same time.  [0069]  Also as mentioned above, the functional group Y  may be one or more and is present as a substituent of the  aromatic ring structure or is present in the ring structure.  [0070]  Concretely there are following aromatic ring struc› tures.  (i) Aromatic Ring Structures in Which the Funct)ona) Group  Y is Bonded to the Carbon Atom of the Aromatic Rmg as a  Substituent  [0071]  Examples thereof are:  and the like.  (ii) Aromatic Ring Structures in Which the Atom Forming  the Functional Group Y (Cation Portion in the Case of the  Salt Y 2 )  Constitutes the Aromatic Ring at the Same Time  [0072]  Examples thereof when the functional group Y is  amine are:  and the like.  (iii) Aromatic Ring Structures in Which the Functional  Group Y is Further Bonded as a Substituent to the Carbon  Atom of the Aromatic Ring Structure (ii)  [0073]  Preferred examples thereof are:  -continued  y  I  J__  Cl.  6  (),y  N  I  &&  N  Y  N  Y- y  N  y  00( 0-Y-•  Y-0-Y- q- y  00(_• Py  F3C  c{-. c{-.  0  S  mm  0-CH,Y Y-0-CH,Y  ]q  O-CH,Y- CH2Y,  YH2C-o-Y-,  y  Y-o-CH2Y-•  OOCH,Y 