Oxidation Base 21, Zoba 4R, 2-amino-4,6-dinitro-phenol, Fourrine 4R, 2-amino-4,6-dinitro-1-hydroxybenzene, 1-hydroxy-2-amino-4,6-dinitrobenzene, Fourrine 93, Acide picramique, 1-amino-2-hydroxy-3,5-dinitrobenzene, Phenol, 2-amino-4,6-dinitro-, 2-amino-4,6-DNP, Picramic acid, Furro 4R, 4,6-dinitro-2-aminophenol, 6-Amino-2,4-dinitrophenol