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-[(Z)-heptadec-9-enoyl]oxy-2-[(6Z,9Z,12Z,15Z)-octadeca-6,9,12,15-tetraenoyl]oxypropyl] (12Z,15Z,18Z,21Z,24Z,27Z,30Z,33Z)-hexatriaconta-12,15,18,21,24,27,30,33-octaenoate into molecular formula.
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C74H118O6
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