You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1'R,2'R,5'R,6'R,8'S)-5'-(hydroxymethyl)-8'-methylspiro[cyclopentane-1,4'-tricyclo[6.3.1.02,5]dodecane]-1',6'-diol is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H30O3
assistant