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 CCCC1N(C(=O)c2ncccc2C(F)(F)F)CCCC1(Oc1csc(C(F)(F)F)c1)C(=O)N1CCC(C#N)(c2ccccc2COCCC(C)(C)C(=O)OC)CC1 .
assistant