neutral red base;N,N,7-Trimethylphenazine-2,8-diamine;N',N',3-Trimethyl-2,8-phenazinediamine;2,8-Phenazinediamine, N8,N8,3-trimethyl-;2-Methyl-3-amino-7-(dimethylamino)phenazine
ChEBI: A member of the class of phenazines carrying methyl, amino and dimethylamino substituents at positions 2, 3 and 7 respectively. The free base of neutral red, which acts as a pH indicator, changing from red to yellow between pH 6.8 and 8.0.