Patent ID: 7294621

Claim:
A method of combating tumors in a subject in need of such treatment, comprising administering to said subject a compound of Formula I in an amount effective to inhibit such activity: wherein: R 1 is a branched or unbranched, saturated or unsaturated C 6 to C 18 alkyl group optionally substituted from 1 to 5 times with —OH, —COOH, oxo, or amine or substituted or unsubstituted aromatic; X is selected from the group consisting of NHCO, CH 3 NCO, CONH, CONCH 3 , S, SO, SO 2 , NH, and NCH 3 ; R 2 is a branched or unbranched, saturated or unsaturated C 6 to C 14 alkyl group optionally substituted from 1 to 5 times with —OH, —COOH, oxo or amine or substituted or unsubstituted aromatic; Y is selected from the group consisting of NHCO, CH 3 NCO, CONCH 3 , S, SO, SO 2 , O, NH, and NCH 3 ; R 6 is a branched or unbranched C 2 to C 6 alkyl group; and R 3 , R 4 , and R 5 are independently methyl or ethyl, or R 3 and R 4 together with N form a heterocyclic ring having five or six members and R 5 is methyl or ethyl.