Imported nucleotide and oligonucleotide solutions-customs classification dispute over CTH 29349990 vs 38229090; exemption claim denied.

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.

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Issues: (i) Whether the goods imported by the applicant are classifiable under CTH 29349990; (ii) Whether the kits imported by the applicant are eligible for exemption from Basic Customs Duty under Entry 102 of Notification No. 45/2025-Customs dated 24.10.2025 read with S. No. 55 of List 3 (Solution of Nucleotides/Nucleosides).

Issue (i): Whether the subject goods merit classification under Tariff Item 29349990 (nucleic acids and their salts; other heterocyclic compounds) rather than under Chapter 38 residuary entries.

Analysis: The Authority applied the General Rules for Interpretation (HSN Rules), the HSN Explanatory Notes and the scheme of the Customs Tariff Act. The goods are identifiable as nucleotides/nucleosides or modified nucleic acid molecules with definite chemical structure and composition. Chapter 29 is dedicated to chemically defined organic compounds and covers single-molecule substances even when dissolved; Chapter 38 is residuary for mixtures, preparations or reagents. Where competing residuary headings exist, the heading reflecting the intrinsic chemical identity prevails. The Authority further examined whether the goods were certified reference materials or diagnostic preparations; records did not show the requisite certification or degree of certainty to treat them as certified reference materials, nor did the goods exhibit the essential character of preparations or diagnostic reagents as imported.

Conclusion: The subject goods are classifiable under CTH 29349990. This conclusion is in favour of the assessee.

Issue (ii): Whether the subject goods are eligible for exemption under Entry 102 of Notification No. 45/2025-Customs read with Entry No. 55 of List 3 (Solution of Nucleotides and Nucleosides) which grants nil basic customs duty to specified lifesaving drugs/medicines and diagnostic test kits.

Analysis: The Authority examined the scope and wording of the exemption notification and the entries in List 3. The exemption applies to lifesaving drugs/medicines (including salts and esters) and diagnostic test kits specifically enumerated in the list. The applicant's own submissions and the factual record indicated that the imported items, in the form imported, are nucleic acid salts/chemically defined compounds that do not possess, in that form, the essential character or end-use of lifesaving drugs/medicines or of diagnostic reagents/test kits contemplated by the notification. The exemption entry is specific and must be strictly construed; goods not satisfying the substantive conditions cannot be included within the concessional ambit.

Conclusion: The subject goods are not eligible for exemption under Entry 102 read with Entry No. 55 of List 3. This conclusion is against the assessee.

Final Conclusion: The Authority allows the advance ruling application, holding that the goods are classifiable under CTH 29349990 but are not eligible for the specified customs exemption; the classification determination is effective prospectively.

Ratio Decidendi: Where competing residuary tariff headings exist, classification must follow the heading that accords with the essential chemical identity of the goods; chemically defined single-molecule nucleotides/nucleosides are classifiable under Chapter 29 rather than as miscellaneous or preparative reagents under Chapter 38, and specific exemption notifications must be strictly construed so that only goods meeting the notification's substantive character and end-use qualify for duty concession.

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