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): CC1(C)CC1C(=O)O.COC(=O)NC(C(=O)N1CCCC1c1nc(-c2ccc(-c3ccc(NC(=O)c4ccc(N5CC(C)NCC5C)nc4)c(C)n3)cc2)c[nH]1)C(C)C .
assistant