You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [3-[(9Z,12Z,15Z)-octadeca-9,12,15-trienoyl]oxy-2-[(Z)-tetracos-13-enoyl]oxypropyl] (Z)-triacont-19-enoate by IUPAC nomenclature, provide its molecular formula.
user
C75H136O6
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