Involved in biosynthesis of morphinan-type benzylisoquinoline alkaloids. Catalyzes the conversion of the phenanthrene alkaloid salutaridinol to salutaridinol-7-O-acetate, the immediate precursor of thebaine along the morphine biosynthetic pathway. Conversion of 7-O-acetylsalutaridinol into thebaine is spontaneous. (7S)-salutaridinol + acetyl-CoA = (7S)-O-acetylsalutaridinol + CoA Optimum pH is 7-9. Optimum temperature is 47 degrees Celsius. Alkaloid biosynthesis; morphine biosynthesis. Expressed in root, stem, leaf and capsule of the mature plant (PubMed:11404355, PubMed:16813579). Restricted to sieve elements of the phloem adjacent or proximal to laticifers (PubMed:16813579). Increases rapidly between 1 and 3 days after seed germination. Belongs to the plant acyltransferase family.