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
Given the following product, please provide possible reactants. <molecule_2d>
user
Possible reactant(s): CCc1nc(C)c(C(=O)Nc2ccc(B3OC(C)(C)C(C)(C)O3)cc2)o1.COC(=O)CC12CCC(c3ccc(Br)cc3)(CC1)CO2 .
assistant