Using CCOCc1nc2c(N)nc(C)c(C)c2n1CCOCC#Cc1ccccc1 to produce CCOCc1nc2c(N)nc(C)c(C)c2n1CCOCCCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.