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 CNS(=O)(=O)c1ccc2c(C(=O)O)c[nH]c(=O)c2c1.NCC(O)CN1CCC(Oc2ccc(Cl)c(Cl)c2)CC1 .
assistant