You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,4S,5R,6S,8R,9S)-5,6,8-trihydroxy-6-methyl-13-azatetracyclo[7.7.0.01,13.04,9]hexadecan-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H25NO4
assistant