use of the protecting groups di-n-butylaminomethylene,2-nitrophenylsulfenyl and the ester of 2- ( hydroxymethyl ) -9,10-anthraquinone , enabled us for the first time to prepare nucleopeptide fragments containing 2'-deoxyguanosine and a free carboxylic acid group .
C0014898
ester
C0007066
carboxylic acid