You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4S,4aR,5S,5aR,6R,12aR)-4-(dimethylamino)-6-ethyl-1,5,10,11,12a-pentahydroxy-3,12-dioxo-4a,5,5a,6-tetrahydro-4H-tetracene-2-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C23H26N2O8
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