6442-05-3 Benzoic acid, 5-[[4'-[[2,4-dihydroxy-3-[(4-sulfo-1-naphthalenyl)azo]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-2-hydroxy-, disodium salt C.I. 30155 C.I. Direct Brown 21 C.I. Direct Brown 21, disodium salt Congo Brown R NSC47759 Pontamine Brown CR Tertrodirect Brown CR