N-acetylglucosaminyl-diphospho-decaprenol L-rhamnosyltransferase (, WbbL) is an enzyme with systematic name dTDP-6-deoxy-beta-L-mannose:N-acetyl-alpha-D-glucosaminyl-diphospho-trans,octacis-decaprenol 3-alpha-L-rhamnosyltransferase. This enzyme catalyses the following chemical reaction
This enzyme requires Mn<sup>2+</sup> or Mg<sup>2+</sup>.