Using O=C(O)COCCOCCNC(=O)OCC1c2ccccc2-c2ccccc21, C=C(C)C to produce CC(C)(C)OC(=O)COCCOCCNC(=O)OCC1c2ccccc2-c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.