You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R)-2-heptadecanoyloxy-3-phosphonooxypropyl] (4E,7E,10E,13E,16E)-docosa-4,7,10,13,16-pentaenoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C42H73O8P
assistant