6,7-Dihydro-4(2-pyridyl)dipyrido[1,2-
a
:2
'
,1
'
-
c
]pyrazinediium
(R
4
= 2-pyridyl)
Dickeson, J.E.; Summers, L.A.
Experientia 25: 1247-8 (1969)
E
= –320(mV), pH = 1.5-8.2
Pol., Br
–
salt
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(R4 = 2-pyridyl)
(R4 = 2-pyridyl)