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
To synthesis <molecule_2d>, what are the possible reactants? Write in the SMILES representation.
user
CCCCN(CCCC)C(=O)c1nn(-c2ccc(C(=O)NS(=O)(=O)c3ccc4ccc(OCc5ccccc5)cc4c3)cc2C(=O)N2CCc3ccccc3C2)c(C)c1Cl
assistant