Using CC(C)(C)OC(=O)N=C1SCC(COC(=O)OC(C)(C)C)N1C(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)NC1=NC(CO)CS1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.