You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4S,4aS,5aR,12aR)-7-(5-bromopyridin-3-yl)-4-(dimethylamino)-1,10,11,12a-tetrahydroxy-3,12-dioxo-4a,5,5a,6-tetrahydro-4H-tetracene-2-carboxamide;methane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H28BrN3O7
assistant