Additional Polycyclo Heterocyclic Ring System Attached Directly Or Indirectly To The Bicyclo Ring System By Nonionic Bonding Patents (Class 548/454)
- Lactone ring containing (e.g., 3,3-bisindolyl phthalides, etc.) (Class 548/456)
- Ring carbon of one of the five-membered hetero rings is bonded directly to ring carbon of the other (e.g., indigo dyes, etc.) (Class 548/457)
- Ring carbon of each of the two five-membered hetero rings is bonded directly to chalcogen or nitrogen (e.g., both rings may be bonded to the same nitrogen atom or to different nitrogen atoms, etc.) (Class 548/460)
