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(2013/09/02)2-(1-trityl-1H-tetrazol-5-yl)ethyl 4-methylbenzenesulfonate
tert-butyl {6-chloro-9-[2-(1-trityl-1H-tetrazol-5-yl)ethyl]-9H-purin-2-yl}carbamate
tert-butyl {6-chloro-9-[2-(1-trityl-1H-tetrazol-5-yl)ethyl]-9H-purin-2-yl}(4-cyclohexylbenzyl)carbamate
tert-butyl (4-cyclohexylbenzyl){6-(cyclopentylamino)-9-[2-(1-trityl-1H-tetrazol-5-yl)ethyl]-9H-purin-2-yl}carbamate
tert-butyl (4-cyclohexylbenzyl){6-(isobutylamino)-9-[2-(1-trityl-1H-tetrazol-5-yl)ethyl]-9H-purin-2-yl}carbamate