93268 ⎘
Derivatives of carbonic acid containing functional groups covered by groups - in which at least one nitrogen atom of these functional groups is further bound to another nitrogen atom not being part of a nitro or nitroso group; Compounds containing any of the groups , e.g. semicarbazides the other nitrogen atom being further doubly-bound to a carbon atom, e.g. semicarbazones the carbon atom being part of a ring other than a six-membered aromatic ring