 Along with OHPC, OHPA was synthesized by Karl Junkmann of Schering AG in 1953 and was first reported by him in the medical literature in 1954.OHPC shows very low oral activity and was introduced for use via intramuscular injection by Squibb in 1956 under the brand name Delalutin.Although a substantial prolongation of action occurs when OHPC is formulated in oil, the same was not observed to a significant extent with OHPA, and this is likely why OHPC was chosen by Schering for development over OHPA.