2,7-Naphthalenedisulfonic acid, 3-amino-4-[[4'-[(1-amino-4-sulfo-2-naphthalenyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-, trisodium salt 5413-69-4 Brilliant Purpurin R Brilliant Purpurine R C.I. 23510 C.I. Direct Red 15 C.I. Direct Red 15 trisodium salt C.I. Direct Red 15, trisodium salt NSC7815 Tertrodirect Scarlet PR