tokens: 11 beta , 19-epoxy-4 , 21-dihydroxypregn-4-ene-3 , 20-dione ( 2 ) was hydrogenated with Pd-C to yield a mixture of all four dihydro derivatives 5 , accompanied by 4 , 21-diacetoxy-11 beta , 19-epoxy-3-hydroxypregnan-20-one ( 6 ) and 21-acetoxy-11 beta , 19-epoxy-4-hydroxypregnane-3 , 20-dione ( 7 ) .