The molecule of the title compound, C17H22N2O2, consists of a piperidi
n-4-one ring trans fused to a cyclohexane moiety. The piperidine ring
has a twist conformation. The ring N atom has a trigonal planar geomet
ry. The cyclohexane ring adopts a chair conformation. The nitroso grou
p is almost coplanar to the best plane of the piperidine ring. The phe
nyl ring is in the axial position.