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
Given the following product, please provide possible reactants. <molecule_2d>
user
Possible reactant(s): CC1CN(C2COC2)CCN1c1ccc(Nc2cc(-c3ccnc(N4CCc5c(sc6c5CC(C)(C)C6)C4=O)c3C=O)cn(C)c2=O)nc1 .
assistant