You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [2-[(10Z,13Z,16Z,19Z)-docosa-10,13,16,19-tetraenoyl]oxy-3-hexadecanoyloxypropyl] (20Z,23Z,26Z,29Z)-dotriaconta-20,23,26,29-tetraenoate by IUPAC nomenclature, provide its molecular formula.
user
C73H126O6
assistant