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 (4Z,9Z,15Z)-5-(4-tert-butylphenyl)-20-(4-ethylphenyl)-10-(4-methylphenyl)-15-phenyl-1,20,21,23-tetrahydroporphyrin .
user
C51H46N4
assistant