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Under IUPAC nomenclature, a molecule named (19E,21E,23E,25E,27E,29E,31E)-33-[3,5-dihydroxy-6-methyl-4-(prop-2-enoxycarbonylamino)oxan-2-yl]oxy-37-ethoxycarbonyloxy-1,3,5,6,9,11,17-heptahydroxy-15,16,18-trimethyl-13-oxo-14,39-dioxabicyclo[33.3.1]nonatriaconta-19,21,23,25,27,29,31-heptaene-36-carboxylic acid is given. What is its corresponding molecular formula?
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C54H81NO21
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