Patent ID: 8110597

Claim:
A compound represented by the following general formula (I): wherein R 1 and R 2 each independently represent a substituent, R 3 to R 6 are the same or different, and each represent a substituted or unsubstituted alkyl group; R 7 and R 8 represent a substituted or unsubstituted alkyl group; L 1 to L 3 are the same or different, and each represent a substituted or unsubstituted methine group; r represents an integer of 0 to 3; and two or more L 2 and L 3 existing when r is 2 or larger may be the same or different; P and Q independently represent 123 I, 124 I, 125 I, 131 I or 18 F; M represents hydrogen atom, Na, or K; and m and n independently represent an integer of 0 to 2.