Reverse production systems background

Pyrazino[2,3-fc]pyrazines365 and pyrazino[2,3-h]quinoxalines366 (230) are reduced similarly to pyrazines and quinoxalines to the 1,4- and 5,10-dihydro derivatives, respectively [Eq. (127)], with which they form reversible systems. 5,10-Dihydropyrazinoquinoxaline gives an ill-defined wave near the background discharge, but the structure of the product is unknown. 

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