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 COc1cc(NS(=O)(=O)N(C)C)cc(-c2cn(COCC[Si](C)(C)C)c3ncnc(NC(C)c4nn5ccc(C)c5c(=O)n4-c4ccccc4)c23)c1 .
assistant