The Bicyclic Ring System Consists Of A 1,3-diazine Ring, Which May Be Hydrogenated, Fused To A Five-membered N-hetero Ring (e.g., Purine Isoesters Like Tubercidin, Toyocamycin, Sangivamycin, Sparsomycin A, Etc.) Patents (Class 536/27.2)
- Carbonyl, thiocarbonyl, or nitrogen, other than as nitro or nitroso, bonded directly to the sugar ring (Class 536/27.22)
- Carbonyl, thiocarbonyl, additional hetero ring or nitrogen, other than as nitro or nitroso, attached indirectly to the sugar ring by acyclic nonionic bonding (Class 536/27.23)
- Arabinose is sugar moiety (Class 536/27.4)
- Ketose is sugar moiety (e.g., decoyinine, psicofuranosylpurines, etc.) (Class 536/27.5)
- Nitrogen, other than nitro or nitroso, bonded directly to the 6-position of a purine ring system (e.g., adenosine, etc.) (Class 536/27.6)
- Additional nitrogen bonded directly to the 2-position of the purine ring system (Class 536/27.61)
- Nitrogen, chalcogen, or additional carbon bonded directly to the 6-position nitrogen (e.g., 6-position nitrogen is substituted, etc.) (Class 536/27.62)
- Chalcogen, halogen, or benzene bonded directly to carbon of the purine ring system (e.g., isoguanosine, 2-fluoroadenosine, etc.) (Class 536/27.7)
- Chalcogen bonded directly to the 6- or 2-position of a purine ring system (e.g., inosine, etc.) (Class 536/27.8)