Coloring compound and yellow toner containing the coloring compound

A coloring compound for a colorant for a yellow toner, comprising a structure represented by the following formula (1):

• wherein:
• R1 represents an alkyl group or an aryl group;
• R2 represents a hydrogen atom, a cyano group, or —CONH2;
• R3 represents —NR8,R9, where R8 and R9 each independently represent a group selected from a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, an n-heptyl group, an n-octyl group, a 2-ethylhexyl group, an n-nonyl group, an n-decyl group, an n-undecyl group and an n-dodecyl group, and the total number of the carbon atoms of R8 and R9 is from 12 to 24;
• and
• R4, R5, R6, and R7 each independently represent a hydrogen atom, a halogen atom, —CF3, —NO2, an alkyl group, or an alkyloxy group.