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 [(2R,4S)-4-(octadecylcarbamoyloxymethyl)oxetan-2-yl]methyl N-acetyl-N-[(1-ethylpyridin-1-ium-2-yl)methyl]carbamate .
user
C35H60N3O6+
assistant