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 (4aR,8aR)-8a-hydroxy-1-propan-2-ylspiro[3,4a,5,6,7,8-hexahydroquinazoline-4,1'-cyclohexane]-2-one .
user
C16H28N2O2
assistant