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 CCN1CCC(c2ccc(Nc3cc(-c4cccc(-n5ncc6cc(C(C)(C)C)cc(F)c6c5=O)c4COC(C)=O)nn(C)c3=O)nc2)CC1 .
assistant