Carboxyamide-function compounds; amide-function compounds of carbonic acid › Cyclic amides (including cyclic carbamates) and their derivatives; salts thereof

292421Subheading

2924.21 — Ureines and their derivatives; salts thereof:

Ureines và các dẫn xuất của chúng; muối của chúng:

Distinguish from heading:3102Mineral or chemical fertilisers…2933Heterocyclic compounds with…

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