Crystal structure of 9,9′-{(1<i>E</i>,1′<i>E</i>)-[1,4-phenylenebis(azanylylidene)]bis(methanylylidene)}bis(2,3,6,7-tetrahydro-1<i>H</i>,5<i>H</i>-pyrido[3,2,1-<i>ij</i>]quinolin-8-ol)
Acta crystallographica. Section E, Crystallographic communications