You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (1R,4Z,6R,7R,11S,12S,17R)-4-ethylidene-7,12-dihydroxy-6,7-dimethyl-14-oxido-2,9-dioxa-14-azoniatricyclo[9.5.1.014,17]heptadecane-3,8-dione using the IUPAC nomenclature.
user
C18H27NO7
assistant