ISO 18857-2 4-tert-Octylphenol, Internal standard, assorted in acetone 1446.14 4-tert-Octylphenol 1 µg/mL 3689.16 4-tert-Octylphenol monoethoxylate 1 µg/mL 3753.18 4-tert-Octylphenol diethoxylate 1 µg/mL 3754.20 4-tert-Octylphenol triethoxylate 1 µg/