Crystal structure of bis(1-lithio-1,2-diphenylhydrazine)-1,2-dilithio- 1,2-diphenylhydrazine-tetrakis(diethyl ether), [(C6H5)2N2Li]2[(C6H5)2N2Li2](C4H10O)4 - Bosold F. (Zeitschrift für Kristallographie - New Crystal Structures, 1998)