You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S,6R)-6-[(4E,7aR)-4-[(2Z)-2-[(5S)-5-hydroxy-2-methylidenecyclohexylidene]ethylidene]-7a-methyl-2,3,3a,5,6,7-hexahydro-1H-inden-1-yl]-1,1,1-trideuterio-2-(trideuteriomethyl)heptane-2,3-diol is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H44O3
assistant