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
CC1=CC(=O)N(c2cc([NH3+])cc(N3C(=O)C=C(C)C3=O)c2)C1=O.CN(C)c1cccc2c(S(=O)(=O)Cl)cccc12
assistant