You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I need a molecule that meets the following conditions: The molecule is photochromic. Please represent the molecule in SMILES.
user
CCC(=O)COC(=O)c1c2c(c3ccccc3c1CC(C)=O)OC(c1ccccc1)(c1ccc(C)cc1)C=C2
assistant