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): Cc1ccc(S(=O)(=O)n2cc(-c3cnn(Cc4cccc(C)c4)c3)c3cc(-c4ccc(N5CCN(CC(C)O)CC5)nc4)cnc32)cc1 .
assistant