吡啶-2,6-二甲醛

1,4,7,10,13,16(2,6)-hexapyridina-cyclooctadecaphane

3,11-Dithia-17,18-diazatricyclo[11.3.1.15,9]octadeca-1(17),5,7,9(18),13,15-hexaene

3,11,19-trithia[3.3.3]pyridinophane