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Cyclic N-Oxides

Heterocyclic compounds in which an oxygen is attached to a cyclic nitrogen. They include PYRROLIZIDINE ALKALOIDS; QUINOLIZINES; INDOLES; and TROPANES.


Oxygen

An element with atomic symbol O, atomic number 8, and atomic weight 16. It is the most abundant element on earth and essential for respiration.

Molecular oxygen, O2, having two unpaired electrons in its most stable form.



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