The chemical Xylenol orange has a designated molecular formula of C31H32N2O13S and a molecular weight of 672.658 g/mol. Synonyms may include: 3,3'-Bis(N,N-di-(carboxymethyl)aminomethyl)cresolsulfonephthalein, m-Cresolphthalexon S, o-Cresolphthalexon S, EINECS 216-553-8, NSC 324982, UNII-S2VDY878QD (ChemID).