label: UDP-2-acetamido-2,6-dideoxy-alpha-D-xylo-hex-4-ulose => UDP-2-acetamido-2,6-dideoxy-beta-L-arabino-hex-4-ulose
label_lc: udp-2-acetamido-2,6-dideoxy-alpha-d-xylo-hex-4-ulose => udp-2-acetamido-2,6-dideoxy-beta-l-arabino-hex-4-ulose