Using C[C@H](Nc1ncnc2[nH]cnc12)c1nc2ccccc2n1C1CCNCC1, O=C1COC1 to produce C[C@H](Nc1ncnc2[nH]cnc12)c1nc2ccccc2n1C1CCN(C2COC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.