You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [(1R,9R,10R)-17-methyl-17-azoniatetracyclo[7.5.3.01,10.02,7]heptadeca-2(7),3,5-trien-4-yl]methanol .
user
C18H26NO+
assistant