abstract |
As a compound useful as a dye, a compound represented by the formula (Ia) is provided. [R 1a , R 2a , R 3a and R 4a each independently represents an alkyl group having 1 to 20 carbon atoms or a cycloalkyl group having 5 to 10 carbon atoms. However, R 1a , R 2a , R 3a and R 4a are not all the same group. ] |