20.14.61.70 - Halogenated; sulphonated; nitrated or nitrosated derivatives of aldehydes; (including with other oxygen function, cyclic polymers of aldehydes, paraformaldehyde)
Halogenated; sulphonated; nitrated or nitrosated derivatives of aldehydes; (including with other oxygen function, cyclic polymers of aldehydes, paraformaldehyde)
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