Using O=C(NCCc1ccccn1)c1cnc2cc3c(cc2c1S)OCO3 to produce O=c1c2cnc3cc4c(cc3c2sn1CCc1ccccn1)OCO4, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.