(2S,6S)-2-acetamido-6-azaniumylheptanedioate (2S,6S)-2-acetamido-6-azaniumyl-heptanedioate (2S,6S)-2-acetamido-6-ammonioheptanedioate (2S,6S)-2-acetamido-6-ammonio-pimelate N2-Acetyl-L,L-diamino-6-ketopimelate nchembio842-comp23