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 malonyl-CoA:3-hydroxybenzoyl-CoA malonyltransferase.
References
Beerhues L (April 1996). "Benzophenone synthase from cultured cells of Centaurium erythraea". FEBS Letters. 383 (3): 264–6. doi:10.1016/0014-5793(96)00265-7. PMID8925910.