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 a photochromic.
user
Oc1c(Cl)c(Cl)c(N=Nc2ccccc2)c(Cl)c1Cl
assistant