. . . . . . "Sudan IV" . . . . . "Sudan IV" . . . . . . "1-[{2-Methyl-4-[(2-methylphenyl)diazenyl]phenyl}diazenyl]naphthalen-2-ol" . . . . . . . "1-{2-Methyl-4-[(2-methylphenyl)diazenyl]phenyl}azonaphthalen-2-ol" . "Sudan R, C.I. Solvent Red 24, C.I. 26105, Lipid Crimson, Oil Red, Oil Red BB, Fat Red B, Oil Red IV, Scarlet Red, Scarlet Red N.F, Scarlet Red Scharlach, Scarlet R" . .