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
<molecule_2d> Given the product provided, propose some possible reactants that could have been employed in its formation.
user
Here are possible reactants: CN=C=O.COC(=O)NC(C(=O)N1CCCC1c1nc(-c2ccc(-c3ccc(-c4c[nH]c(C5CC6(CNC6)CN5C(=O)C(NC(=O)OC)C(C)C)n4)cc3)cc2)c[nH]1)C(C)C .
assistant