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): C#Cc1ccc(-c2cnc(C3CCCN3C(=O)C(NC(=O)OC)C(C)C)[nH]2)cc1.COC(=O)NC(C(=O)N1CCN(C(=O)OC(C)(C)C)CC1c1nc(-c2ccc(Br)cc2)c[nH]1)C(C)C .
assistant