You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S)-20-hydroxy-12,14,16,20-tetrazatricyclo[10.8.1.013,18]henicosa-13(18),14-dien-17-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H28N4O2
assistant