Using COc1c(C)c2c(c(O)c1CC=C(C)CP(=O)(OC)OC)C(=O)OC2 to produce COc1c(C)c2c(c(O)c1CC=C(C)CP(=O)(O)O)C(=O)OC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.