corticosteroids esterified at c-17 and c-21 such as hydrocortisone 17-butyrate 21-propionate ( hbp ) and prednisolone 17-valerate 21-acetate ( pva ) inhibited pha-induced blastogenesis of human blood lymphocytes more intensively than hydrocortisone ( hc ) and prednisolone ( psl ) , the parent corticosteroids .
C0063076
21
C0020268
hydrocortisone