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
<molecule_2d> Given the product provided, propose some possible reactants that could have been employed in its formation.
user
Here are possible reactants: CC(C)(C)OC(=O)N1CC(OCc2ccc(-c3cc4nccc(Oc5ccc(NC(=O)NC6CC6)cc5F)c4s3)nc2)C1 .
assistant