Using COC(=O)CCC(=O)Oc1c(C)c(C)c2c(c1C)SC(CCC(=O)OC)O2 to produce COC(=O)CCC1Oc2c(C)c(C)c(O)c(C)c2S1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.