You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Give me a molecule that satisfies the conditions outlined in the description: It belongs to the photochromic class of molecules.
user
COCCCc1ccc2c(c1)C(C)(C)C1(C=Nc3c(ccc4ncccc34)O1)N2
assistant