Involved in viguiepinol biosynthesis. Catalyzes the conversion of copalyl diphosphate (ent-CDP) into pimara-9(11),15-diene (PMD). ent-copalyl diphosphate = diphosphate + ent-pimara-9(11),15-diene Activity is highest with Mg(2+). Can also use Co(2+), Zn(2+) and Ni(2+). kcat is 0.0014 sec(-1). Optimum pH is 7.0. Optimum temperature is 30 degrees Celsius. Antibiotic biosynthesis. Monomer. Belongs to the terpene synthase family.