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 CCc1cc(O)c(F)cc1-c1ccc2c(-c3nc4c([nH]3)CCNC4)n[nH]c2c1.O=S(=O)(Cl)c1ccc(F)cc1 .
assistant