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
CN1c2cc3ccccc3cc2C(C)(C)C12C=Nc1cc3c4c(c1O2)CCCN4CCC3
assistant