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OECD International Trade
International Trade By Commodity Statistics (SITC Rev. 3)
5: Chemicals and related products, n.e.s.
51: Organic chemicals
515: Organo-inorganic, heterocycl. compounds, nucl. acids
5156: Lactams; heterocycl. compounds with ox. hetero-atom
5156: Lactams; heterocycl. compounds with ox. hetero-atom
51561: Lactams
51562: Coumarin, methylcoumaries and ethylcoumarins
51563: Other lactones
51569: Heterocyclic compo. with ox. hetero-atom (s), n.e.s.
5156: Lactams; heterocycl. compounds with ox. hetero-atom
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