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 CCOc1nc(C(=O)O)cc(N)c1C#N.NCC1CCN(S(=O)(=O)c2ccc(-c3ccccn3)s2)CC1 .
assistant