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 C=CC(=O)NCCN(C)c1cccc(Nc2cc(-c3cc(F)cc(-n4ncc5c6c(sc5c4=O)CCCC6)c3COC(C)=O)cn(C)c2=O)n1 .
assistant