You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-[(1S,4R,5R,6R,11R,12S,16R,18S,21R)-11,18-dihydroxy-4,6,12,17,17-pentamethyl-9-oxahexacyclo[11.9.0.01,21.04,12.05,10.016,21]docosan-8-yl]-2-hydroxy-2-methylpropan-1-one .
user
C30H48O5
assistant