You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (4S,4aS,5aR,12aR)-4-amino-1,11,12a-trihydroxy-3,12-dioxo-4a,5,5a,6-tetrahydro-4H-tetracene-2-carboxamide into molecular formula.
user
C19H18N2O6
assistant