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 COC(=O)c1cccc(-n2nc(C(Nc3ccc(-c4noc(C)n4)cc3)c3cc(OC)cc(OCCF)c3F)[nH]c2=O)n1 .
assistant