Explanatory notes
… (H 2 NNH 2 ) may, by replacement of one or more hydrogen atoms, give derivatives, e.g. (RHNNH 2 ), and (RHNNHR 1 ), … of one or more hydrogen atoms. Nitrosophenols, which are tautomeric forms of quinone oximes, and nitrosoamines, which … are tautomeric forms of quinoneimine oximes, are excluded from this heading (see Explanatory Notes to headings 29.08 …