You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (2R)-8-[(2R,3R,5R)-4,5-dihydroxy-6-(hydroxymethyl)-3-methyloxan-2-yl]oxy-2-[4-[5-[(2R)-4,5-dihydroxy-6-(hydroxymethyl)-3-methyloxan-2-yl]oxypentanoylamino]butyl]-N-[9-[1-[6-(2,5-dioxopyrrol-1-yl)-4-oxohexoxy]cyclopentyl]oxy-6-oxononyl]-4-oxooctanamide is given. What is its corresponding molecular formula?
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C55H91N3O19
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