Using CCC1CC2(CC1c1nnc3cnc4c(ccn4COCC[Si](C)(C)C)n13)OCCO2 to produce CCC1CC(=O)CC1c1nnc2cnc3c(ccn3COCC[Si](C)(C)C)n12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.