label: 2-[(3S)-3-carboxy-3-(dimethylamino)propyl]-L-histidyl-[translation elongation factor 2] + S-adenosyl-L-methionine => diphthine-[translation elongation factor 2] + S-adenosyl-L-homocysteine + H(+)
label_lc: 2-[(3s)-3-carboxy-3-(dimethylamino)propyl]-l-histidyl-[translation elongation factor 2] + s-adenosyl-l-methionine => diphthine-[translation elongation factor 2] + s-adenosyl-l-homocysteine + h(+)