The Additional Hetero Ring Is Five-membered Having Ring Nitrogen Patents (Class 514/254.01)
- The additional five-membered hetero ring consists of two ring carbons, two ring nitrogens, and one ring chalcogen (e.g., oxadiazolyl, thiadiazolyl, etc.) (Class 514/254.03)
- The additional five-membered hetero ring consists of three ring carbons, and of nitrogen and chalcogen in adjacent ring positions (e.g., isoxazolyl, isothiazolyl, etc.) (Class 514/254.04)