Ceramide hydroxylase involved in the hydroxylation of sphingolipid-associated very long chain fatty acids. Postulated to hydroxylate the very long chain fatty acid of dihydroceramides and phytoceramides at C-2. Binds 2 Zn(2+) ions per subunit that likely form a catalytic dimetal center. Sphingolipid metabolism. Belongs to the sterol desaturase family. SCS7 subfamily. Lacks the conserved N-terminal cytochrome b5 heme-binding domain. Its enzyme activity is therefore unsure.