You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
It belongs to the organic light-emitting device class of molecules. Use the above information to create a molecule.
user
CC1(C)c2ccccc2Oc2c(-c3ccc(-c4nc(-c5ccc6c7c(cccc57)-c5ccccc5-6)c5ccccc5n4)cc3)cccc21
assistant