Chemical name17-alpha-hydroxypregn-4-ene-3,20-dione Molecular formulaC21H30O3 Molecular weight330.47 CAS#68-96-2 EINECS200-699-4 Appearancewhite or white-like crystal powder Melting point≥214 Loss on drying≤0.5% Assay: 99% min Use17A-hydroxyprogesterone is the key intermediate for synthesizing sterides cortical hormone and sterides progestogen.