https://www.taxtmi.com/caselaws?id=783784 Imported solutions/forms of nucleotides, oligonucleotides, and modified nucleic acid molecules were examined for classification under CTH 29349990 versus 38229090. Applying the General Rules for Interpretation, the AAR held Chapter 38 is residuary for mixtures/preparations and cannot apply where goods retain the essential character of single chemically defined compounds; residuary headings are invoked only when no more specific heading fits, and the heading reflecting intrinsic chemical identity must prevail. The goods were therefore classified under CTH 29349990. Separately, exemption from basic customs duty under Entry 102 of Notification No. 45/2025-Customs read with S. No. 55 of List 3 was denied, as the imported kits did not satisfy the exemption description. en-us Wed, 17 Dec 2025 00:00:00 +0530 Wed, 31 Dec 2025 16:21:16 +0530 TaxTMI RSS Generator https://www.taxtmi.com/caselaws?id=783784 Imported solutions/forms of nucleotides, oligonucleotides, and modified nucleic acid molecules were examined for classification under CTH 29349990 versus 38229090. Applying the General Rules for Interpretation, the AAR held Chapter 38 is residuary for mixtures/preparations and cannot apply where goods retain the essential character of single chemically defined compounds; residuary headings are invoked only when no more specific heading fits, and the heading reflecting intrinsic chemical identity must prevail. The goods were therefore classified under CTH 29349990. Separately, exemption from basic customs duty under Entry 102 of Notification No. 45/2025-Customs read with S. No. 55 of List 3 was denied, as the imported kits did not satisfy the exemption description. Case-Laws Customs Wed, 17 Dec 2025 00:00:00 +0530 https://www.taxtmi.com/caselaws?id=783784