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 CC(=O)Oc1ccc(C#CC(O)(CC2(c3cc(C(F)(F)F)ccc3F)CC2)C(=O)Nc2ccc3c(c2)COC3=O)cc1 .
assistant