2617281 Egan 1,2-ethanediyldianthranilate-bridged bis(iminoquinone) C2H4(O2CC6H4-2-(NC6H2-3,5-tBu2-2-O))2 1 2617280 Egan ethylene glycol dianthranilate bridge, forms the chelated bis(amidophenoxide) complex 1