You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I give you a description of a molecule, and you need to return one molecule in SMILES that meets the description. The description: The molecule is photochromic.
user
CC(=O)Oc1cc2c(c3ccccc13)-c1c(cc(C)c3c1C(=O)C=CC3=O)C2(C)C
assistant