Patent ID: 6861415

Claim:
A compound having the general formula: in wherein: R 1 is a member selected from the group consisting of —N(CH 3 ) 2 and —NHCH 3 ; R 2 is a member selected from the group consisting of halogen, alkyl, acyl, hydroxy, alkoxy, acyloxy, alkylcarbonate, cypionyloxy, S-alkyl and S-acyl; R 3 is a member selected from the group consisting of alkyl, hydroxy, alkoxy and acyloxy; R 4 is a member selected from the group consisting of hydrogen and alkyl; and X is a member selected from the group consisting of ═O and ═N—OR 5 , wherein R 5 is a member selected from the group consisting of hydrogen and alkyl; with the proviso that if X is ═O, R 1 is —N(CH 3 ) 2 , R 2 is hydroxy and R 4 is alkyl, then R 3 is other than hydroxy.