| 摘要 |
<p>Dyestuffs of the formula <IMAGE> are used for coloring organic solvents, mineral oil products, waxes, plastics and surface coatings, wherein R is alkyl having 1 to 7 carbon atoms, R1 is alkyl having 1 to 8 carbon atoms or alkenyl having 3 or 4 carbon atoms, and R2 is hydrogen, alkyl having 1 to 8 carbon atoms or alkenyl having 3 or 4 carbon atoms.</p> |
