Involved in the biosynthesis of prenylated phenolics natural products which contribute to the bitter taste of beer and display broad biological activities (Probable). Catalyzes the two last prenylation steps in the beta-bitter acid pathway (PubMed:25564559). Uses dimethylallyl diphosphate (DMAPP) as the prenyl donor (PubMed:25564559). a 2-acyl-4-prenylphloroglucinol + dimethylallyl diphosphate = a 2-acyl-4,6-diprenylphloroglucinol + diphosphate a 2-acyl-4,6-diprenylphloroglucinol + dimethylallyl diphosphate = a 2-acyl-4,6,6-triprenylphloroglucinol + diphosphate Secondary metabolite biosynthesis. Homo- and heteromer. Interacts with PT1L, forming a functional metabolon. Expressed in trichomes. Belongs to the UbiA prenyltransferase family.