Ring Oxygen In The Additional Hetero Ring Patents (Class 546/281.7)
- Plural ring oxygens in the additional hetero ring (Class 546/283.7)
- Polycyclo ring system having the additional hetero ring as one of the cyclos (Class 546/284.1)
- Chalcogen attached directly to the additional hetero ring by nonionic bonding (Class 546/284.4)
- Nitrogen or -C(=X)-, wherein X is chalcogen, attached directly to the additional hetero ring by nonionic bonding (Class 546/284.7)