Explanatory notes
… cover compounds containing nitro or nitroso groups as the only nitrogen function. 29.21 - Amine-function compounds … hydrochloride 2921.19 - - Other - Acyclic polyamines and their derivatives; salts thereof : 2921.21 - … radicals R (methyl, ethyl, phenyl, etc.), respectively). If only one hydrogen atom in the ammonia has been replaced, the …