You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Suppose there is a molecule that meets the following description: The molecule is a nutrient, energy storage, surfactant, emulsifier, pineapple, and fruity. The molecule is a flavoring agent, energy source, membrane stabilizer, earthy, fatty, and green. Please write the SMILES representation of it.
user
CCCC(=O)C(C)=O
assistant