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
Suggest possible substances that may have been involved in the synthesis of the presented compound. <molecule_2d>
user
CC(=O)NCCC1CCc2ccc(N)c(O)c21.CC(CCC(=O)O)OCc1ccccc1
assistant