Two Double Bonds Between Ring Members Of The Diazole Ring (i.e., Imidazole) Patents (Class 548/335.1)
- The nitrogen is multiply bonded to carbon (Class 548/336.1)
- Having -C(=X)-, wherein X is chalcogen, bonded directly to the nitrogen (Class 548/338.1)
- The nitrogen and -C(=X)X-, wherein Xs are the same or diverse chalcogens, are bonded directly to the same acyclic carbon atom (e.g., -amino-4(5)- imidazole propionic acid or histidine, etc.) (Class 548/339.1)
- Chalcogen attached indirectly to the nitrogen by acyclic nonionic bonding (Class 548/340.1)