You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3-[(3aR,6aR,9bS)-1,3,3a,4,5,6,6a,7,8,9,9a,9b-dodecahydrophenalen-3-id-2-yl]propanenitrile;yttrium .
user
C16H21NY-2
assistant