You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 7-[[17-(18-carboxy-2-oxooctadecyl)sulfonyl-14-oxoheptadecanoyl]amino]-2-[3-(ethylamino)-3-oxopropyl]-4-oxooctanedioic acid into molecular formula.
user
C49H86N2O13S
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