21-(4'-Methoxyphenylazo)-1,4,7,14,23-pentaoxa(7.2.2)orthometaorthobenzenophane 21-Mapb 98303-80-1 Diazene, (4-methoxyphenyl)(19,20,22,23-tetrahydro-12H-7,11-metheno-6H-dibenzo(b,k)(1,4,7,10,13)pentaoxacycloeicosin-25-yl)-, (E)-