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 Cc1cc(COc2ccc(C(=O)NCC3(N4CCNCC4)C(=O)NC(=O)NC3=O)cc2)c2ccccc2n1.O=Cc1cccnc1 .
assistant