C.I. Acid Brown 98; Benzenesulfonic acid, 4-[4,5-dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]-, iron complex (9CI); Iron, 4-[4,5-dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulfonic acid complex (9CI); Acid Brown 98; Acid Olive Brown G; C.I. 18840:2; C.I. Acid Brown 277; Chemiderm Brown 5G; Colorosacid Brown 98; Covalene Olive Brown GL; Derma Brown 5G; Derma Brown 5GL; Derma Pardo 5GL; Fabriderm Olive Brown; Lederso S 2 Brown 5G; Polycor Olive Brown G; Roven S 2 Brown 5G; Sandal Acid Brown 5G; Taigalan Olive Brown GT; Triacor Brown 5GLS