(5Z)-5-({1-[2,4-bis(trifluoromethyl)benzyl]piperidin-4-yl}methylidene)-4-{[(3R)-2-oxopyrrolidin-3-yl]amino}-1,3-thiazol-2(5H)-one

N2-[(5Z)-5-({1-[2,4-bis(trifluoromethyl)benzyl]piperidin-4-yl}methylidene)-2-oxo-2,5-dihydro-1,3-thiazol-4-yl]-N,N,O-trimethyl-L-serinamide

N2-[(5Z)-5-({1-[2,4-bis(trifluoromethyl)benzyl]piperidin-4-yl}methylidene)-2-oxo-2, 5-dihydro-1,3-thiazol-4-yl]-N,N-dimethyl-L-leucinamide

N2-[(5Z)-5-({1-[2,4-bis(trifluoromethyl)benzyl]piperidin-4-yl}methylidene)-2-oxo-2,5-dihydro-1,3-thiazol-4-yl]-N,N-dimethyl-L-valinamide

N2-[(5Z)-5-({1-[2,4-bis(trifluoromethyl)benzyl]piperidin-4-yl }methylene)-2-oxo-2,5-dihydro-1,3-thiazol-4-yl]-N,N-dimethyl-L-threoninamide