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Ethyl 2-formamidothiazol-4-acetate

Ethyl 2-formylbenzoate

Ethyl 5-formyl-2,4-dimethyl-1H-pyrrole-3-carboxylate

2-Ethyl-4-formylimidazole

Ethyl 3-(furfurylthio)propionate

Ethyl 2-furoate