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 CN1CC2CCC(C1)N2.COc1ccc2c(c1)C=C(c1c(C(=O)O)c(C(C)C)nn1C1CC1)Cn1c-2c(C2CCCCC2)c2ccc(C(=O)NS(=O)(=O)C(C)C)cc21 .
assistant