1-((2,2',3,3'-Tetramethyl(1,1'-biphenyl)-4-yl)azo)-2-naphthalenol 150151-21-6 2-Naphthalenol, 1-((2,2',3,3'-tetramethyl(1,1'-biphenyl)-4-yl)azo)- Dichlotran K Dichlotrane K