Morpholines (i.e., Fully Hydrogenated 1,4-oxazines Patents (Class 544/106)
- Triazine ring (Class 544/112)
- Diazine ring (Class 544/114)
- Six-membered ring consisting of one nitrogen and five carbons (e.g., pyridine, etc.) (Class 544/124)
- Five-membered hetero ring having two or more ring hetero atoms of which at least one is nitrogen (Class 544/132)
- The five-membered hetero ring has at least sulfur and nitrogen as ring hetero atoms (Class 544/133)
- The five-membered hetero ring has at least oxygen and nitrogen as ring hetero atoms (Class 544/137)
- 1,3-Diazole ring (including hydrogenated) (Class 544/139)
- 1,2-Diazole ring (including hydrogenated) (Class 544/140)
- Five-membered hetero ring consisting of one nitrogen and four carbons (Class 544/141)