Enables pyrimidine nucleotide-sugar transmembrane transporter activity. Acts upstream of or within chondroitin sulfate biosynthetic process; embryonic skeletal system development; and pyrimidine nucleotide-sugar transmembrane transport. Located in endoplasmic reticulum. Is expressed in several structures, including brain; cardiovascular system; gallbladder; gut; and reproductive system. Used to study schneckenbecken dysplasia. Human ortholog(s) of this gene implicated in schneckenbecken dysplasia. Orthologous to human SLC35D1 (solute carrier family 35 member D1). [provided by Alliance of Genome Resources, Apr 2022]