Heterocyclic compounds with oxygen hetero-atom(s) only
293220Subheading
2932.20 — Lactones:
Lactones:
Codes under heading 293220
Distinguish from heading:2918Carbo…3204Synth…2936Provi…2852Inorg…2909Ether…2910Epoxi…2912Aldeh…2930Organ…
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