Using O=S(=O)(C=C(c1ccccc1)c1ccccc1)c1ccccc1, C=O to produce O=S(=O)(C(CO)=C(c1ccccc1)c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.