Using O=CO, CC1=NN=C(c2ccc(N)cc2)c2cc3c(cc2C1)OCO3 to produce CC1=NN=C(c2ccc(NC=O)cc2)c2cc3c(cc2C1)OCO3, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.