You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (4aR,5S,5aR,6S,12aR)-7-amino-1,5,10,11,12a-pentahydroxy-6-methyl-9-nitro-3,12-dioxo-4a,5,5a,6-tetrahydro-4H-tetracene-2-carboxamide .
user
C20H19N3O10
assistant