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: The molecule is a high luminous efficiency, organic electroluminescent device, and electroluminescent compound.
user
CC1(C)C2=CCCC=C2C2CC=C(C3CC(n4c5c(c6cc(-c7ccc8c9c(n(C%10C=CC=CC%10)c8c7)C=CCC9)ccc64)CCC=C5)=NC4=CC=CCC43)C=C21
assistant