Using CCOC(=O)CC[C@H](NC(=O)c1csc(C#Cc2cnc3nc(NC(=O)C(C)(C)C)nc(O)c3c2)n1)C(=O)OCC to produce CCOC(=O)CC[C@H](NC(=O)c1csc(CCC2CNc3nc(NC(=O)C(C)(C)C)nc(O)c3C2)n1)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.