Patent ID: 7956187

Claim:
A compound of formula I: wherein, A is Y is chosen from O, S, NR 17 and NOH; R 1 is —NHR 8 ; R 2 and R 2a are both hydrogen or taken together R 2 and R 2a are ═O; R 3 is chosen from hydrogen, lower alkyl, alkenyl, aryl, benzyl and hydroxyalkyl; R 4 is chosen from hydrogen, hydroxyl, amino, lower alkoxy, C 1 -C 20 alkyl and C 1 -C 20 alkyl substituted with hydroxyl or carbonyl; R 7 is chosen from hydrogen and hydroxyl; R 5 is a lower alkyl ; R 6 is a lower alkyl; wherein together R 5 and R 6 form one ring, said ring having optional additional substitution; R 8 is chosen from hydrogen, —OH, —NH 2 and —CH 2 R 15 ; R 15 is chosen from hydrogen, alkyl, aryl, substituted aryl and alkyl substituted with alkoxy, amino, alkylamino and dialkylamino; and R 17 is chosen from hydrogen, alkyl, aryl and benzyl.