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: It belongs to the photochromic class of molecules. Please represent the molecule in SMILES.
user
CC1(C)C(C=Cc2cc([N+](=O)[O-])ccc2O)=[N+](CC(=O)O)c2ccccc21
assistant