Containing Nitrogen, Other Than As Nitro Or Nitroso, Attached Directly Or Indirectly To Carbon By Nonionic Bonding Patents (Class 504/326)
- Nitrogen or -C(=X)- attached directly to urea or thiourea nitrogen by nonionic bonding (e.g., biurets, semicarbazones, etc.) (Class 504/328)
- Sulfur attached directly or indirectly to urea or thiourea nitrogen by nonionic bonding (Class 504/329)
- Benzene ring attached directly or indirectly to urea or thiourea nitrogen by nonionic bonding (Class 504/330)