(8aS)-7-[(6-chloronaphthalen-2-yl)sulfonyl]-8a-(methoxymethyl)-1'-pyridin-4-yltetrahydro-5H-spiro[1,3-oxazolo[3,2-a]pyrazine-2,4'-piperidin]-5-one
(8as)-7-[(6-chloronaphthalen-2-yl)sulfonyl]-8a-(methoxymethyl)-1'-pyridin-4-yltetrahydro-5h-spiro[1,3-oxazolo[3,2-a]pyrazine-2,4'-piperidin]-5-one