In enzymology, a glucarate O-hydroxycinnamoyltransferase () is an enzyme that catalyzes the chemical reaction sinapoyl-CoA + glucarate CoA + O-sinapoylglucarate Thus, the two substrates of this enzyme are sinapoyl-CoA and glucarate, whereas its two products are CoA and O-sinapoylglucarate. This enzyme belongs to the family of transferases, specifically those acyltransferases transferring groups other than aminoacyl groups. The systematic name of this enzyme class is sinapoyl-CoA:glucarate O-(hydroxycinnamoyl)transferase. References EC 2.3.1 Enzymes of unknown structure