You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,10R,13R,15R,18S)-6-[(2R,5S,6S)-5-(dimethylamino)-6-methyloxan-2-yl]-7,10,13,18-tetrahydroxy-15-methyl-19-oxapentacyclo[13.3.1.01,10.03,8.013,18]nonadeca-3(8),4,6-triene-2,9,17-trione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H33NO9
assistant