You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Come up with a molecule based on the description: It belongs to the photochromic class of molecules.
user
C=C(C)C(=O)OCCOc1cc(Br)c(C(C)(C)c2cc(Br)c(OCCOC(=O)C(=C)C)cc2Br)cc1Br
assistant