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
Given the following product, please provide possible reactants. <molecule_2d>
user
Possible reactant(s): CCc1ccc(C(O)C(C)(C)NC(=O)c2ccc(-c3cnc4ccc(-c5cnn(C(c6ccccc6)(c6ccccc6)c6ccccc6)c5)cn34)cc2F)cc1 .
assistant