| 291211 | 291211 - Aldehydes; acyclic, without other oxygen function, methanal ( |
| 291212 | 291212 - Aldehydes; acyclic, without other oxygen function, ethanal (a |
| 291213 | 291213 - -- Butanal (butyraldehyde, normal isomer) |
| 291219 | 291219 - Aldehydes; acyclic, without other oxygen function, n.e.c. in |
| 291221 | 291221 - Aldehydes; cyclic, without other oxygen function, benzaldehyd |
| 291229 | 291229 - Aldehydes; cyclic, without other oxygen function, other than |
| 291230 | Aldehyde-alcohols |
| 291241 | 291241 - Aldehydes; aldehyde-ethers, aldehyde-phenols and aldehydes wi |
| 291242 | 291242 - Aldehydes; aldehyde-ethers, aldehyde-phenols and aldehydes wi |
| 291249 | 291249 - Aldehyde-alcohols, aldehyde-ethers, aldehyde-phenols and alde |
| 291250 | 291250 - Aldehydes; cyclic polymers of aldehydes |
| 291260 | 291260 - Paraformaldehyde |