4. Organic compounds -- part of the class 532-570 series
  5. Organic compounds
  6. Four or more ring nitrogens in the bicyclo ring system

Natural Drug Sciences LLC

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5H-Pyrano[2,3-d: 6,5-d']dipyrimidine...

Organic compounds -- part of the class 532-570 series – Organic compounds – Four or more ring nitrogens in the bicyclo ring system
Reexamination Certificate

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Biologically active substance on the basis of tetracyclic nitrog

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Heterocyclic carbon compounds containing a hetero ring...
Patent

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