Uridine diphosphate-N-acetylglucosamine (UDP-GlcNAc) transporter in the Golgi apparatus. May supply UDP-GlcNAc as substrate for Golgi-resident glycosyltransferases that generate branching of diantennary oligosaccharides (By similarity). Interacts with SLC35A2; the interaction is reduced in the presence of SLC35A4 (By similarity). Found in a complex with SLC35A2 and SLC35A4 (By similarity). Belongs to the nucleotide-sugar transporter family. SLC35A subfamily.