28801-57-2 Dibenzo(b,k)(1,4,7,10,13,16)hexaoxacyclooctadecin, eicosahydro-2,?-bis(1,1-dimethylethyl)- Eicosahydro-2,?-bis(1,1-dimethylethyl)dibenzo(b,k)(1,4,7,10,13,16)hexaoxacyclooctadecin