label: trans-4-hydroxy-L-prolyl-[Skp1 protein] + UDP-N-acetyl-alpha-D-glucosamine => O-(N-acetyl-alpha-D-glucosaminyl)-trans-4-hydroxy-L-prolyl-[Skp1 protein] + UDP + H(+)
label_lc: trans-4-hydroxy-l-prolyl-[skp1 protein] + udp-n-acetyl-alpha-d-glucosamine => o-(n-acetyl-alpha-d-glucosaminyl)-trans-4-hydroxy-l-prolyl-[skp1 protein] + udp + h(+)