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 2-[(4S,4aS,8aR)-4-hydroxy-4-phenyl-2,3,4a,5,6,7,8,8a-octahydroquinolin-1-yl]pyridine-3-carbonitrile .
user
C21H23N3O
assistant