The Hetero Ring Is Five-membered Patents (Class 549/29)
- Tetracyclo ring system having the hetero ring as one of the cyclos (Class 549/42)
- Tricyclo ring system having the hetero ring as one of the cyclos (Class 549/43)
- Bicyclo ring system having the hetero ring as one of the cyclos (Class 549/49)
- Plural ring hetero atoms in the bicyclo ring system (Class 549/50)
- Chalcogen attached directly to the bicyclo ring system by nonionic bonding (Class 549/51)
- Chalcogen attached directly to the hetero ring by nonionic bonding (Class 549/52)
- Chalcogen attached directly to ring sulfur of the hetero ring by nonionic bonding (Class 549/53)
- Plural chalcogens bonded directly to the bicyclo ring system (Class 549/54)
- Nitrogen attached directly or indirectly to the bicyclo ring system by nonionic bonding (Class 549/55)
- Halogen attached directly or indirectly to the bicyclo ring system by nonionic bonding (Class 549/56)
- Nitrogen or a -C(=X)- group, wherein X is chalcogen, attached directly to the bicyclo ring system by nonionic bonding (Class 549/57)
- Chalcogen attached indirectly to the bicyclo ring system by nonionic bonding (Class 549/58)
- Nitrogen attached directly to the hetero ring by nonionic bonding (Class 549/63)
- Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring (Class 549/64)
- Nitrogen attached indirectly to the hetero ring by nonionic bonding (Class 549/65)
- Chalcogen attached indirectly to the hetero ring by nonionic bonding (Class 549/66)
- Chalcogen attached directly to ring sulfur of the hetero ring by nonionic bonding (Class 549/67)