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): CCCc1cc(CO[Si](C)(C)C(C)(C)C)ccc1OC(C(=O)NS(=O)(=O)c1ccc(C(C)C)cc1)c1ccc2c(c1)OCO2 .
assistant