Patent ID: 6900193

Claim:
A compound having the general formula: wherein: R 1 is a member selected from the group consisting of —N(CH 3 ) 2 , —NHCH 3 , —NC 4 H 8 , —NC 5 H 10 , and —NC 4 H 8 O; R 2 is a member selected from the group consisting of hydrogen, halogen, alkyl, acyl, hydroxy, alkoxy, acyloxy, alkylcarbonate, cypionyloxy, S-alkyl, —SCN, S-acyl, and —OC(O)R 6 , wherein R 6 is a member selected from the group consisting of alkyl, alkoxy ester and alkoxy; R 3 is a member selected from the group consisting of alkyl-alkoxy, alkoxy and acyloxy; R 4 is a member selected from the group consisting of hydrogen and alkyl; 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; and wherein: if R 1 is —N(CH 3 ) 2 or —NHCH 3 , R 2 is hydrogen R 3 is acetyloxy and R 4 is alkyl, then X is other than ═O and ═N—OR 5 , wherein R 5 is methyl.