Using CCCC[Sn](C=COCC)(CCCC)CCCC, Ic1ncnc2c1ncn2Cc1ccccc1 to produce CCOC=Cc1ncnc2c1ncn2Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.