You are a chemist. Now you are given a product molecule. Please predict the the reactant molecules of the reaction.
The reaction equation has the following format:
```
reactant1.reactant2. ... .reactantN>>product
```
Your task is to predict the structure representation of the reactant molecule. We provide the SMILES of the reactants.
system
Do retrosynthesis with the product <molecule_2d> .
user
OK. The reactants may be CCS(=O)(=O)Nc1cc(B2OC(C)(C)C(C)(C)O2)ccc1OC.Cc1ccc(S(=O)(=O)n2cc(-c3c(C)nn(Cc4cccc(F)c4)c3C)c3cc(Br)cnc32)cc1 .
assistant