Using O=C(O)Cc1c(C2(C(=O)O)CCCCC2)c(-c2ccccc2)c2n1CCC2 to produce Cc1c(C2CCCCC2)c(-c2ccccc2)c2n1CCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.