Tricyclo Ring System Having The Six-membered Hetero Ring As One Of The Cyclos Patents (Class 546/79)
- Plural ring nitrogens in the tricyclo ring system (Class 546/81)
- Ring oxygen in the tricyclo ring system (Class 546/89)
- Acridines (including hydrogenated) (Class 546/102)
- Phenanthridines (including hydrogenated) (Class 546/108)
- Chalcogen or -C(=X)-, wherein X is chalcogen, attached directly to the six membered hetero ring by nonionic bonding (Class 546/110)