You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (3S,3aR,4S,11aR)-4-hydroxy-3-methyl-3,3a,4,5,6,8,9,10,11,11a-decahydrofuro[2,3-e]azecine-2,7-dione into its molecular formula.
user
C12H19NO4
assistant