Using [NH4+], CCCn1c(COCC)nc2cnc3cc(OC4CCN(C(=O)OC(C)(C)C)CC4)ccc3c21 to produce CCCn1c(COCC)nc2c(N)nc3cc(OC4CCN(C(=O)OC(C)(C)C)CC4)ccc3c21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.