You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1S,2S,5S,6R,9R,12S,13R,16S,18S)-16-[(2R,4S,5R,6R)-5-amino-4-methoxy-6-methyloxan-2-yl]oxy-6,13-dimethyl-7-oxapentacyclo[10.8.0.02,9.05,9.013,18]icosane-2,6-diol by IUPAC nomenclature, provide its molecular formula.
user
C28H47NO6
assistant