You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aS,5R,5aR)-1,5,10,11-tetrahydroxy-6-methyl-9-(1,3-oxazol-2-yl)-3,12-dioxo-4,4a,5,5a,6,12a-hexahydrotetracene-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H20N2O8
assistant