You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Conceptualize a molecule that meets the specified attribute(s): The molecule is a photochromic.
user
CCOC(=O)c1c2c(c3cccc4c3c1-c1ccccc1-4)OC(c1ccc(OC)cc1)(c1ccc(OC)cc1)C=C2
assistant