Benzene Ring Containing Patents (Class 564/47)
- The benzene ring is part of a substituent which contains sulfur (Class 564/49)
- The benzene ring is part of a substituent which contains nitrogen (Class 564/50)
- The benzene ring is part of a substituent which contains oxygen (Class 564/52)
- The benzene ring is part of a substituent which contains halogen bonded directly to carbon (Class 564/53)
- Plural benzene rings bonded directly to urea nitrogen (Class 564/55)