label: UDP-2,3-diacetamido-2,3-dideoxy-alpha-D-mannuronate => UDP-2,3-diacetamido-2,3-dideoxy-alpha-D-glucuronate
label_lc: udp-2,3-diacetamido-2,3-dideoxy-alpha-d-mannuronate => udp-2,3-diacetamido-2,3-dideoxy-alpha-d-glucuronate