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
To synthesis <molecule_2d>, what are the possible reactants? Write in the SMILES representation.
user
CC(C)(C)OC(=O)C1(ON=C(C(=O)O)c2csc(NC(c3ccccc3)(c3ccccc3)c3ccccc3)n2)CCCC1.NC1C(=O)N2C(C(=O)O)=C(CSc3nnnn3N)CSC12
assistant