preferred_name: 2-aminobut-2-enoate + methanethiol => L-methionine
preferred_name_lc: 2-aminobut-2-enoate + methanethiol => l-methionine
label: 2-aminobut-2-enoate + methanethiol => L-methionine
label_lc: 2-aminobut-2-enoate + methanethiol => l-methionine