preferred_name: (2S,6S)-2,6-diaminopimelate = meso-2,6-diaminopimelate
preferred_name_lc: (2s,6s)-2,6-diaminopimelate = meso-2,6-diaminopimelate
label: (2S,6S)-2,6-diaminopimelate = meso-2,6-diaminopimelate
label_lc: (2s,6s)-2,6-diaminopimelate = meso-2,6-diaminopimelate