1,4,10,13-Tetraoxa-7,16-diazacyclooctadecane, 7,16-bis(2,8-dichloro-1H-purin-6-yl)- 149246-40-2 1H-Purine, 6,6'-(1,4,10,13-tetraoxa-7,16-diazacyclooctadecane-7,16-diyl)bis(2,8-dichloro- 6,6'-(1,4,10,13-Tetraoxa-7,16-diazacyclooctadecane-7,16-diyl)bis(2,8-dichloro-1H-purine)