You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [3-[[3-[[2-[(Z)-hexadec-9-enoyl]oxy-3-[(6Z,9Z,12Z,15Z,18Z,21Z)-tetracosa-6,9,12,15,18,21-hexaenoyl]oxypropoxy]-hydroxyphosphoryl]oxy-2-hydroxypropoxy]-hydroxyphosphoryl]oxy-2-hydroxypropyl] (17Z,20Z,23Z,26Z)-dotriaconta-17,20,23,26-tetraenoate into molecular formula.
user
C81H138O16P2
assistant