You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [2-[(9Z,11Z,13Z,15Z)-octadeca-9,11,13,15-tetraenoyl]oxy-3-[(7Z,9Z)-tetradeca-7,9-dienoyl]oxypropyl] (9Z,11Z,13Z,15Z,17Z)-henicosa-9,11,13,15,17-pentaenoate into molecular formula.
user
C56H86O6
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