| Harmonised Commodity Description and Coding System (HS) - level 2 - Chapter | 29 | Organic chemicals | 
                
                  
                    | Harmonised Commodity Description and Coding System (HS) - level 4 - Article | 291211 | Methanal "formaldehyde" | 
                
                  
                    | Harmonised Commodity Description and Coding System (HS) - level 4 - Article | 291212 | Ethanal "acetaldehyde" | 
                
                  
                    | Harmonised Commodity Description and Coding System (HS) - level 4 - Article | 291219 | Acyclic aldehydes, without other oxygen function (excl. methanal [formaldehyde] and ethanal [acetaldehyde]) | 
                
                  
                    | Harmonised Commodity Description and Coding System (HS) - level 4 - Article | 291221 | Benzaldehyde | 
                
                  
                    | Harmonised Commodity Description and Coding System (HS) - level 4 - Article | 291229 | Cyclic aldehydes, without other oxygen function (excl. benzaldehyde) | 
                
                  
                    | Harmonised Commodity Description and Coding System (HS) - level 4 - Article | 291241 | Vanillin "4-hydroxy-3-methoxybenzaldehyde" | 
                
                  
                    | Harmonised Commodity Description and Coding System (HS) - level 4 - Article | 291242 | Ethylvanillin "3-ethoxy-4-hydroxybenzaldehyde" | 
                
                  
                    | Harmonised Commodity Description and Coding System (HS) - level 4 - Article | 291249 | Aldehyde-alcohols, aldehyde-ethers, aldehyde-phenols and aldehydes with other oxygen function (excl. ethylvanillin "3-ethoxy-4-hydroxybenzaldehyde" and vanillin "4-hydroxy-3-methoxybenzaldehyde") | 
                
                  
                    | Harmonised Commodity Description and Coding System (HS) - level 4 - Article | 291250 | Cyclic polymers of aldehydes | 
                
                  
                    | Harmonised Commodity Description and Coding System (HS) - level 4 - Article | 291260 | Paraformaldehyde |