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): Cn1cc(-c2ccnc(-n3ncc4cc(C(C)(C)C)cc(F)c4c3=O)c2C=O)cc(Nc2cc3n(n2)CCN(CC(F)F)C3)c1=O .
assistant