Thiolase is reported to be structurally related to beta-ketoacyl synthase (Pfam:PF00109), and also chalcone synthase.

1: The 1.8 A crystal structure of the dimeric peroxisomal 3-ketoacyl-CoA thiolase of Saccharomyces cerevisiae: implications for substrate binding and reaction mechanism. Mathieu M, Modis Y, Zeelen JP, Engel CK, Abagyan RA, Ahlberg A, Rasmussen B, Lamzin VS, Kunau WH, Wierenga RK; J Mol Biol 1997;273:714-728. PMID:9402066