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): C=CCOC1CC(C=C(C)C2OC(=O)C3CCCCN3C(=O)C(=O)C3(O)OC(C(OC)CC(C)CC(C)=CC(CC)C(=O)CC(O[Si](C)(C)C(C)(C)C)C2C)C(OC)CC3C)CCC1N=[N+]=[N-] .
assistant