You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-hydroxy-2-[[2-[[(10Z,13Z,16Z)-9-[(3Z,6Z,9Z,12Z,15Z)-octadeca-3,6,9,12,15-pentaenoyl]oxydocosa-10,13,16-trienoyl]amino]acetyl]amino]propanoic acid by IUPAC nomenclature, provide its molecular formula.
user
C45H70N2O7
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