4-Bromo-6,7-dihydrodipyrido[1,2-a:2',1'-c]pyrazinediium

(R4 = Br)
Pojer, P.M.; Summers, L.A.
J. Heterocycl. Chem. 11: 303-5 (1974)

E = –10(mV), pH = 1.9-4.5

Pol., Br– salt, unstable pH 7.

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