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