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Name the molecular formula for the molecule established as 6-[6-(2-amino-1,2-dihydropyridin-5-yl)-2-[3,4-dihydroxy-5-(2-hydroxyethyl)phenyl]-3',4',5,5'-tetrahydroxy-4-oxo-8-(1H-pyrrol-2-ylmethyl)spiro[6H-pyrano[3,2-h][1]benzoxepine-9,6'-oxane]-2'-carbonyl]oxy-3,3,4,5-tetrahydroxyoxane-2-carboxylic acid using the IUPAC nomenclature.
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C42H43N3O20
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