Patent ID: 7390771

Claim:
A composition comprising: at least one type of a compound represented by Formula (1); wherein R 1 and R 2 each independently represent hydrogen or C 1 -C 6 alkyl, a 1 represents an integer of 1 to 6, n 1 represents 0, 1 or 2, m 1 represents 0 or an integer in the range of 1 to 3, R 3 and R 4 each independently represent nitro, carboxyl, halogen, C 1 -C 6 alkyl or C 2 -C 6 alkenyl, m 2 and m 3 each independently represent 0, 1 or 2; R 3 and R 4 may be different to each other when m 2 and m 3 each represent 2, Y 1 represents CO or NR 5 CO wherein R 5 represents hydrogen or C 1 -C 6 alkyl); and at least one of the group consisting of a compound represented by Formula (2); wherein R 6 and R 7 each independently represent hydrogen or C 1 -C 6 alkyl, a 2 represents an integer of 1 to 6, n 2 represents 0, 1 or 2, m 4 represents 0 or an integer in the range of 1 to 3, R 8 and R 9 each independently represent nitro, carboxyl, halogen, C 1 -C 6 alkyl or C 2 -C 6 alkenyl, m 5 and m 6 each independently represent 0, 1 or 2; R 8 and R 9 may be different to each other when m 5 and m 6 each represent 2, Y 2 represents CO or NR 10 CO wherein R 10 represents hydrogen or C 1 -C 6 alkyl; and a compound represented by Formula (3); wherein R 11 and R 12 each independently represent hydrogen or C 1 -C 6 alkyl, a 3 represents an integer of 1 to 6, n 3 represents 0, 1 or 2, m 7 represents 0 or an integer in the range of 1 to 3, R 13 and R 14 each independently represent nitro, carboxyl, halogen, C 1 -C 6 alkyl or C 2 -C 6 alkenyl, m 8 and m 9 each independently represent 0, 1 or 2; R 13 and R 14 may be different to each other when m 8 and m 9 each represent 2, Y 3 represents CO or NR 15 CO wherein R 15 represents hydrogen or C 1 -C 6 alkyl.