label: 2-[(3S)-3-aminopiperidin-1-yl]-1-(2-cyanobenzyl)-5-methyl-4,6-dioxo-3,4,5,6-tetrahydropyrrolo[3,4-d]imidazol-1-ium
label_lc: 2-[(3s)-3-aminopiperidin-1-yl]-1-(2-cyanobenzyl)-5-methyl-4,6-dioxo-3,4,5,6-tetrahydropyrrolo[3,4-d]imidazol-1-ium