2912 Aldehydes, Whether or not With Other Oxygen Function, Cyclic Polymers of Aldehydes, Paraformaldehyde

2912 (01/1988-..) Aldehydes, Whether or not With Other Oxygen Function, Cyclic Polymers of Aldehydes, Paraformaldehyde 29121100 (01/1988-..) Methanal `formaldehyde` 29121200 (01/1988-..) Ethanal `acetaldehyde` 29121300 (01/1988-12/2006) Butanal `butyraldehyde, Normal Isomer` 29121900 (01/2012-..) Acyclic Aldehydes, Without Other Oxygen Function (Excl. Methanal [formaldehyde] and Ethanal [acetaldehyde]) 29121910 (01/2007-12/2011) Butanal `butyraldehyde, Normal Isomer` 29121990 (01/2007-12/2011) Acyclic Aldehydes, Without Other Oxygen Function (Excl. Methanal [formaldehyde], Ethanal [acetaldehyde] and Butanal [butyraldehyde, Normal Isomer]) 29122100 (01/1988-..) Benzaldehyde 29122900 (01/1988-..) Cyclic Aldehydes, Without Other Oxygen Function (Excl. Benzaldehyde) 29123000 (01/1988-12/2011) Aldehyde-alcohols 29124100 (01/1988-..) Vanillin `4-hydroxy-3-methoxybenzaldehyde` 29124200 (01/1988-..) Ethylvanillin `3-ethoxy-4-hydroxybenzaldehyde` 29124900 (01/2012-..) Aldehyde-alcohols, Aldehyde-ethers, Aldehyde-phenols and Aldehydes With Other Oxygen Function (Excl. Ethylvanillin `3-ethoxy-4-hydroxybenzaldehyde` and Vanillin `4-hydroxy-3-methoxybenzaldehyde`) 29125000 (01/1988-..) Cyclic Polymers of Aldehydes 29126000 (01/1988-..) Paraformaldehyde