Synonyms: PHENOLPHTHALEIN DIPHOSPHATE, TETRACOLAMINE SALT;2-HYDROXYETHYLAMINE PHENOLPHTHALEIN DIPHOSPHATE;COLAMINPHENOLPHTHALEIN PHOSPHATE, TETRACOLAMINE SALT;Phenolphthalein Diphosphate,Tetracolamine Salt(1.24533);isobenzofuran-3,3-diylbis(p-phenyleno) hydrogen phosphate, compound with 2-aminoethanol (1:4);1(3H)-Isobenzofuranone, 3,3-bis4-(phosphonooxy)phenyl-, compd. with 2-aminoethanol (1:4)