You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 9-(1-amino-2-hydroxyethyl)-6,9,11-trihydroxy-7-(5-hydroxy-4,6-dimethyloxan-2-yl)oxy-4-methoxy-8,10-dihydro-7H-tetracene-5,12-dione;7-(4-amino-5-hydroxy-6-methyloxan-2-yl)oxy-6,9,11-trihydroxy-9-(2-hydroxyacetyl)-4-methoxy-8,10-dihydro-7H-tetracene-5,12-dione by IUPAC nomenclature, provide its molecular formula.
user
C55H62N2O21
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