You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I need a molecule that meets the following conditions: It belongs to the photochromic class of molecules. Please represent the molecule in SMILES.
user
C1=CC(c2ccc(N3CCCC3)cc2)(c2ccc(N3CCCC3)cc2)Oc2ccc3ccc4c(c3c21)C=CC(c1ccc(N2CCCC2)cc1)(c1ccc(N2CCCC2)cc1)O4
assistant