Synonyms: Phosphoricacid, 1,4-phenylene tetrakis(2,6-dimethylphenyl) ester (9CI); Hydroquinolbis[di(2,6-dimethylphenyl)]phosphate; Hydroquinone bis(di-2,6-xylyl phosphate); PX 201; SX 6502;Tetra(2,6-xylyl) hydroquinone diphosphate; Tetrakis(2,6-dimethylphenyl)p-phenylene bisphosphate; Tetrakis(2,6-dimethylphenyl) p-phenylene diphosphate;Tetrakis(2,6-xylyl) p-phenylene diphosphate