preferred_name: an N-acyl-D-mannosamine => an N-acyl-D-glucosamine
preferred_name_lc: an n-acyl-d-mannosamine => an n-acyl-d-glucosamine
label: an N-acyl-D-mannosamine => an N-acyl-D-glucosamine
label_lc: an n-acyl-d-mannosamine => an n-acyl-d-glucosamine