Nomen chemicum:(17a,20E)-17,20-[(1-Methoxyethylidene)bis(oxy)]-3-oxo-19-norpregna- 4,20-diene-21-carboxylic Acidum Methyl Ester. CAS: 431579-34-9 or * 1370003-76-1 Formulae hypotheticae: C25H34O6C25H34O6 pondus hypotheticum: 430.54 Puritas:99% Aspectus:Alba pulveris Gradus:Pharmaceutical Grade