You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Generate a molecule that fulfills the requirement: The molecule is a photochromic.
user
COc1ccc(C2(c3ccc4c(c3)CC(C)O4)CC(=O)c3c(CO)c(-c4ccccc4)c4c(cc(OC)c5ccccc54)c3O2)cc1
assistant