label: [hyaluronan](n) + UDP-N-acetyl-alpha-D-glucosamine = N-acetyl-beta-D-glucosaminyl-(1->4)-[hyaluronan](n) + UDP + H(+)
label_lc: [hyaluronan](n) + udp-n-acetyl-alpha-d-glucosamine = n-acetyl-beta-d-glucosaminyl-(1->4)-[hyaluronan](n) + udp + h(+)