To our knowledge, faradiol esters of certified purity are presently not commercially
available. For quality control purposes and for a clinical pilot study on the topical
effects of Calendula constituents, we needed gram-quantities of the faradiol esters
(1–3). In this paper we describe an efficient method for the preparative isolation of
these major constituents. We also report on accompanying maniladiol esters (4, 5)
which were purified along with the major compounds.