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
<molecule_2d> Given the product provided, propose some possible reactants that could have been employed in its formation.
user
Here are possible reactants: CC1(C)OB(B2OC(C)(C)C(C)(C)O2)OC1(C)C.CN1CCN(C(=O)c2ccc(NC(=O)Nc3ccc(Br)cc3)cc2)CC1 .
assistant