Patent ID: 8877718

Claim:
A method of treating multiple myeloma or B-cell lymphoma comprising administering to a patient in need of such treatment a therapeutically effective amount of a compound having the general formula, wherein R 1 , R 2 , and R 3 are independently selected from the group consisting of (a) H, (b) a C 1 -C 18 alkyl, wherein said alkyl is straight, branched or cyclic, (c) a C 1 -C 18 alkenyl, wherein said alkenyl is straight, branched or cyclic, (d) an aryl or heteroaryl, (e) an acyl group or acyl groups being branched, heteroatom-substituted or aryl-substituted, (f) a sugar or another acetal, and (g) a sulfonyl group; R 4 and R 5 are independently selected from the group consisting of (a′) H, (b′) a C 1 -C 18 alkyl, wherein said alkyl is straight, branched or cyclic, (c′) a C 1 -C 18 alkenyl, wherein said alkenyl is straight, branched or cyclic, (d′) an aryl or heteroaryl, (e′) an acyl group or acyl groups being branched, heteroatom-substituted or aryl-substituted, (f′) a C- or O-linked sugar or another acetal, (g′) —OH or —SH, (h′) an alkoxy group, wherein the alkyl group of said alkoxy group is straight, branched or cyclic, (i′) an alkyl group bound via a sulfur atom, (j′) a sulfonyl group, (k′) —NH 2 , —NHR, —NRR′, —NC or —NO 2 , and (1′) —Fl, —Cl, —Br, —I, —CN; wherein R and R′ are, independently, alkyl, aryl, heteroaryl, alkenyl, alkynyl, acyl, or sulfonyl group; and R 3 and R 4 as well as R 4 and R 5 are optionally linked, thereby resulting in a ring; as well as salts thereof.