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 based on this description: It belongs to the photochromic class of molecules.
user
CCC1(CC)CCC2(CC1)c1cc(Sc3c(C)cccc3C)ccc1-c1c2cc(O)c2cc(OC)c(Sc3c(C)cccc3C)cc12
assistant