Using O=C1NCCN1, OC[P+](CO)(CO)CO to produce O=C1NCCN1C[P+](CN1CCNC1=O)(CN1CCNC1=O)CN1CCNC1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.