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 CCC1CC1(NC(=O)C1CC(Oc2cc(-c3csc(NC(C)C)n3)nc3c(Cl)c(OCCN4CCOCC4)ccc23)CN1C(=O)C(NC(=O)OC1CC2CC2C1)C(C)(C)C)C(=O)OC .
assistant