1-[1-[(2S)-3-(6-chloronaphthalen-2-yl)sulfonyl-2-hydroxypropanoyl]piperidin-4-yl]-1,3-diazinan-2-one 1-[1-[(2S)-3-[(6-chloro-2-naphthyl)sulfonyl]-2-hydroxy-propanoyl]-4-piperidyl]hexahydropyrimidin-2-one 1-[1-[(2S)-3-[(6-chloro-2-naphthyl)sulfonyl]-2-hydroxy-1-oxopropyl]-4-piperidinyl]-2-hexahydropyrimidinone 1-[1-[(2S)-3-(6-chloronaphthalen-2-yl)sulfonyl-2-hydroxy-propanoyl]piperidin-4-yl]-1,3-diazinan-2-one