Using C[Si]1(c2ccccc2)CCN(c2ccc(N3CCN(C(=O)O)c4ccccc43)nc2)CC1 to produce C[Si]1(c2ccccc2)CCN(c2ccc(N3CCNc4ccccc43)nc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.