acetyl-CoA + taxa-4(20),11-dien-5alpha-ol = CoA + taxa-4(20),11-dien-5alpha-yl acetate Alkaloid biosynthesis; taxol biosynthesis; 10-deacetyl-2-debenzoylbaccatin III from taxa-4(20),11-dien-5alpha-ol: step 1/3. Belongs to the plant acyltransferase family.