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 CC(Cn1ccc(-c2ccc(C#N)c(Cl)c2)n1)NC(=O)c1nc(-c2cn(C(c3ccccc3)(c3ccccc3)c3ccccc3)cn2)no1 .
assistant