Using O=C1Nc2c(Br)cccc2C1c1cc2c(cc1O)OCO2, C=O to produce O=C1Nc2c(Br)cccc2C1(CO)c1cc2c(cc1O)OCO2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.