C21H28O4

The molecular formula C21H28O4 may refer to:


 * 11-Dehydrocorticosterone
 * 18-Deoxyaldosterone
 * 21-Deoxycortisone
 * Deprodone
 * Formebolone
 * 7-Keto-DHEA acetate
 * 11-Nor-9-carboxy-THC