U.S. imports of Cyclic Amides (NES), Cyclic Carbamates & Derivatives; Salts (SITC 51479) totaled $70.2M in August 2026, imported from 32 countries.
Importers of Cyclic Amides (NES), Cyclic Carbamates & Derivatives; Salts paid $9.0M in duties in August 2026, an average duty rate of 13.38% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Cyclic Amides (NES), Cyclic Carbamates & Derivatives; Salts imports of $70.2M in August 2026 ran 13% above the year-to-date monthly average of $62.0M.
Last updated: August 2026 dataCyclic amides not elsewhere specified — including cyclic carbamates — encompass a broad range of lactam-based and ring-containing amide structures used in pharmaceutical active ingredients, polymer precursors (such as caprolactam-related compounds), and specialty solvents. The NES qualifier means classification here is appropriate only after confirming the compound is not captured by a more specific cyclic-amide provision such as those covering barbituric acid derivatives or lactams with dedicated headings. Section 301 tariff exposure applies to certain cyclic organic chemicals of Chinese origin, making country-of-origin documentation a routine compliance step.
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590 import shipments a month
Compounds with their own dedicated tariff provisions — such as certain barbituric acid derivatives, uracil-based pharmaceuticals, and named lactams — are excluded and must be classified in their respective specific headings. A thorough review of the full amide section of the tariff schedule, ideally with a licensed customs broker, is necessary before defaulting to this residual provision.
Many cyclic organic chemicals sourced from China are subject to Section 301 tariffs. The applicable list and rate tier depend on the specific HTS subheading. Importers should verify current Section 301 coverage for their specific compound using the USTR's official list and consult a customs broker for the most current status.
Basic heading 51 of 465 in section 5
Basic heading 51479 · $70.2M of $27.5B
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Imports · August 2026
origin
Switzerland and China together supply 62% of it. China pays 25.4% duty; Ireland 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$70.2MYoY · free account
Exports
$27.0MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $741.6M of Cyclic Amides (NES), Cyclic Carbamates & Derivatives; Salts and exported $272.3M.
Through August 2026. Source: U.S. Census Bureau.