Using O=c1c2c(-c3cncnc3)cccc2ccn1C1CC1c1ccc2ccccc2n1, Cl to produce O=c1c2c(-c3cncnc3)cccc2c(Cl)cn1C1CC1c1ccc2ccccc2n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.