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abstract, agent, aldehyde, atoms, biocide, carbon, carcinogen, chemical, chemistry, circle, color, concept, disinfectant, embalming, ether, fixative, form, formaldehyde, formalin, formol, gas, glycol, hydrogen, icon, indoor, line, methanal, methyl, methylene, molecule, outline, oxide, oxygen, pharma, pharmaceutical, pollutant, pollution, preservative, science, scientific, shape, silhouette, simple, stick structure, structure, stylized, symbol, tissue, vaccine, volatile,