N-(2-acetamido)-3-iminodiacetic acid
2-(Bis-{[(S)-2-hydroxy-1-(4-methoxy-phenyl)-ethylcarbamoyl]-methyl}-amino)-N-[(S)-2-hydroxy-1-(4-methoxy-phenyl)-ethyl]-acetamide
2-(Bis-{[(S)-1-(4-chloro-phenyl)-2-hydroxy-ethylcarbamoyl]-methyl}-amino)-N-[(S)-1-(4-chloro-phenyl)-2-hydroxy-ethyl]-acetamide
2-(Bis-{[(S)-1-(4-tert-butyl-phenyl)-2-hydroxy-ethylcarbamoyl]-methyl}-amino)-N-[(S)-1-(4-tert-butyl-phenyl)-2-hydroxy-ethyl]-acetamide
2-{Bis-[((R)-2-hydroxy-1-phenyl-ethylcarbamoyl)-methyl]-amino}-N-((R)-2-hydroxy-1-phenyl-ethyl)-acetamide