17-Hydroxycorticosterone 21.beta.-cyclopentylpropionate 508-99-6 Cortef fluid Cortisol, 21-cyclopentanepropionate Hydrocortisone 21.beta.-cyclopentanepropionate Hydrocortisone cyclopentyl propionate Hydrocortisone cypionate NSC10721 Pregn-4-ene-3,20-dione, 21-(3-cyclopentyl-1-oxopropoxy)-11,17-dihydroxy-, (11.beta.)-