113041-61-5 144280-21-7 38613-77-3 EINECS 254-037-4 Irgafos P-EPQFF Irgafos PEPQ Irganox P-EPQ Irgaphos P-EPO PEPQ Phos 2 Phosphonous acid, (1,1'-biphenyl)-4,4'-diylbis-, tetrakis(2,4-bis(1,1-dimethylethyl)phenyl) ester Sandostab P-EPQ Sandostab PEPQ Sanduvor P-EPQ Tetrakis(2,4-di-tert-butylphenyl) (1,1-biphenyl)-4,4'-diylbisphosphonite