2-(1,3-dioxo-1,3-dihydro-2H-inden-2-ylidene)malononitrile--6,7,9,10,17,18,20,21-octahydrodibenzo[b,k][1,4,7,10,13,16]hexaoxacyclooctadecine

2-(1,3-dioxo-1,3-dihydro-2H-inden-2-ylidene)malononitrile--6,7,9,10,17,18,20,21-octahydrodibenzo[b,k][1,4,7,10,13,16]hexaoxacyclooctadecine