1,4,10-Trioxa-7,13-diazacyclopentadecane, 7,13-di(1H-purin-6-yl)- 149246-41-3 1H-Purine, 6,6'-(1,4,10-trioxa-7,13-diazacyclopentadecane-7,13-diyl)bis- 6,6'-(1,4,10-Trioxa-7,13-diazacyclopentadecane-7,13-diyl)bis-1H-purine