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
Given the following product, please provide possible reactants. <molecule_2d>
user
Possible reactant(s): COC(=O)NC(C(=O)N1CC2(CC2)CC1c1ncc(-c2ccc(-c3ccc4cc(-c5cnc(C6CC(C#N)CN6)[nH]5)ccc4c3)cc2)[nH]1)C(C)C.COC(=O)NC(C(=O)O)C(C)C .
assistant