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
With the given product <molecule_2d>, suggest some likely reactants that were used in its synthesis.
user
CC(CO[Si](c1ccccc1)(C(C)(C)C)C(C)(C)C)Oc1cc(Oc2ccc(S(C)(=O)=O)cc2)cc2cc(C3=NCC(CC(=O)O)S3)[nH]c12.[NH4+]
assistant