51333-22-3 51372-28-2 (S ISOMER) 51372-29-3 (R ISOMER) AIDS-070524 AIDS070524 Budesonide Pregna-1,4-diene-3,20-dione, 16,17-butylidenebis(oxy)-11,21-dihydroxy-, [11.beta.,16.alpha.] Rhinocort