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
With the given product <molecule_2d>, suggest some likely reactants that were used in its synthesis.
user
Cc1cc(C=O)ccc1OCCOC(=O)c1ccc(COc2cccc(C(NC(=O)OC3CN4CCC3CC4)c3ccccc3)c2)cc1.NCC(O)c1ccc(O)c2[nH]c(=O)ccc12
assistant