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(C)n2nc(CC3=C(O)CC(CCc4ccc(C(C)NC(=O)OC(C)(C)C)cc4)(C4CCCC4)OC3=O)nc2n1 .
assistant