128255-51-6 19-Nor-1,2-secoergost-9(11)-en-2-oicacid, 12-(acetyloxy)-6,7-epoxy-5-hydroxy-22,24,25-[propylidynetris(oxy)]-, g-lactone, [5a,6a,7a,10b,12a,22R(S)]- 128255-53-8 19-Nor-1,2-secoergost-9(11)-en-2-oicacid, 6,7-epoxy-5-hydroxy-12-oxo-22,24,25-[propylidynetris(oxy)]-, g-lactone, [5a,6a,7a,10b,22R(S)]-