| Tariff Classification |
| section 06 | Products of the chemical or allied industries |
| chapter 29 | Organic chemicals |
| 29.20 | Esters of other inorganic acids of non-metals (excluding esters of hydrogen halides) and their salts; their halogenated, sulphonated, nitrated or nitrosated derivatives: |
| －Phosphite esters and their salts; their halogenated, sulphonated, nitrated or nitrosated derivatives: |
| 2920.21 | －－Dimethyl phosphite |
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