You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [3-[(4Z,7Z,10Z,13Z)-hexadeca-4,7,10,13-tetraenoyl]oxy-2-[(11Z,14Z)-icosa-11,14-dienoyl]oxypropyl] (Z)-tetratriacont-23-enoate by IUPAC nomenclature, provide its molecular formula.
user
C73H128O6
assistant