Patent ID: 7790735

Claim:
A compound of the formula: wherein R 1 is hydrogen, alkenyl, alkynyl, or aminoalkyl; R 2 and R 9 are independently hydrogen, alkyl, alkenyl, alkynyl, or aminoalkyl; R 3 , R 4 , and R 5 , are each independently hydrogen, hydroxyl, alkoxy, alkyl, alkenyl, alkynyl, aryl, acyl, alkylamino, arylamino, phosphoryl, or phosphonyl; R 8 and R 7 are each independently sulfur or oxygen; and R 10 is methylene, dihalomethyl, carbonyl, or sulfoxide; or a salt of said compound; with the proviso that when R 1 is hydrogen, R 2 is methyl, R 4 and R 5 are hydroxyl, R 7 and R 8 are O, R 9 is hydrogen, and R 10 is methylene, R 3 is not hydrogen.