The function of CSGALNACT2 (chondroitin sulfate N-acetylgalactosaminyltransferase 2, Ensembl gene identifier ENSG00000169826) is as follows. Transfers 1,4-N-acetylgalactosamine (GalNAc) from UDP-GalNAc to the non-reducing end of glucuronic acid (GlcUA). Required for addition of the first GalNAc to the core tetrasaccharide linker and for elongation of chondroitin chains. {ECO:0000269|PubMed:12433924, ECO:0000269|PubMed:12446672}.