Synonyms: 3,3'-BIS[N,N-DI(CARBOXYMETHYL)AMINOMETHYL]PHENOLPHTHALEIN;3,3'-BIS[N,N-BIS(CARBOXYMETHYL)AMINOMETHYL]PHENOLPHTHALEIN;PHENOLPHTHALEIN COMPLEXONE;PHENOLPHTHALEXON;N,N’-[[3-oxo-1(3H)-isobenzofuranylidene]bis(6-hydroxy-3,1-phenylene)methylene]bis(N-carboxymethyl)Glycine;Phenolphthalexone;N,N'-[(3-oxo-1(3H)-isobenzofuranylidene)bis[(6-hydroxy-3,1-phenylene)methylene]]bis[N-(carboxymethyl)glycine;N,N'-[[3-oxo-1(3H)-isobenzofuranylidene]bis(6-hydroxy-3,1-phenylene)methylene]bis(N-carboxymethyl)Glycine