SMILES: C1=CC=C2C(=C1)C(=C3C4=C(C(=O)C(=O)C3=C2O)N=CC=C4)O
Description: The molecule is an organic heterotetracyclic compound that is naphtho[2,3-f]quinoline-7,12-dione carrying two additional hydroxy groups at positions 5 and 6. Used as an acid-base indicator. Between pH 0.0 and pH 1.6 it changes from pink to yellow, and between pH 6.0 and pH 7.6 it changes from yellow to green. It has a role as an acid-base indicator. It is an organic heterotetracyclic compound, a member of phenols and a member of p-quinones.