You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (3Z,4E)-5-[4-(4,6-diphenylpyridin-2-yl)phenyl]-3-ethylidene-20,20-dimethyl-4-prop-2-enylidene-5-azapentacyclo[11.7.0.02,6.07,12.014,19]icosa-1(13),2(6),7,9,11,14,16,18-octaene .
user
C49H38N2
assistant