Aldehydes, whether or not with other oxygen function; cyclic polymers of aldehydes; paraformaldehyde

291211 Aldehydes; acyclic, without other oxygen function, methanal (formaldehyde) 291212 Aldehydes; acyclic, without other oxygen function, ethanal (acetaldehyde) 291219 Aldehydes; acyclic, without other oxygen function, n.e.c. in item no. 2912.1 291221 Aldehydes; cyclic, without other oxygen function, benzaldehyde 291229 Aldehydes; cyclic, without other oxygen function, other than benzaldehyde 291241 Aldehydes; aldehyde-ethers, aldehyde-phenols and aldehydes with other oxygen function, vanillin (4-hydroxy-3-methoxybenzaldehyde) 291242 Aldehydes; aldehyde-ethers, aldehyde-phenols and aldehydes with other oxygen function, ethylvanillin (3-ethoxy-4-hydroxybenzaldehyde) 291249 Aldehyde-alcohols, aldehyde-ethers, aldehyde-phenols and aldehydes with other oxygen function; other than vanillin (4-hydroxy-3-methoxybenzaldehyde) and ethylvanillin (3-ethoxy-4-hydroxybenzaldehyde) 291250 Aldehydes; cyclic polymers of aldehydes 291260 Paraformaldehyde