(2S,3R)-N(4)-((S)2,2-dimethyl-1-methylcarbamoylpropyl)-N(1)-hydroxy-2-hydroxymethyl-3-phenylsuccinamide
(2s,3r)-n(4)-((s)2,2-dimethyl-1-methylcarbamoylpropyl)-n(1)-hydroxy-2-hydroxymethyl-3-phenylsuccinamide