A compound of formula or a pharmaceutically acceptable salt thereof wherein R 1 and R 2 are the same or different and are selected from the group consisting of C 1 -C 5 alkyl, phenyl, methylphenyl, R 3 is selected from the group consisting of CH 2 R 8, CH 2 CH 2 R 8, CH=CHR 8, CH 2 CH 2 CH 2 R 8, CH 2 CH=CHR 8, CH=CHCH 2 R 8, CH=CH-OR 8, CH 2 -OR 8, CH 2 CH 2 -OR 8, CH=CH-NHR 8, CH 2 -NHR 8, CH 2 CH 2 -NHR 8, CH=CH-SR 8, CH 2 -SR 8, CH 2 CH 2 -SR 8, substituted or unsubstituted phenyl, benzyl, pyridyl, pyrimidinyl, triazinyl, triazinanyl, oxazinyl, oxazinanyl, cycloexanyl, cycloexenyl, cycloexadienyl, pyranyl, oxathianyl, piperidinyl, cyclopentanyl, cyclopentenyl, cyclopentadienyl, pyrrolidinyl, pyrrolyl, furanyl, oxazolidinyl, pyrazolidinyl, thiophenyl, oxathiinyl, oxathiolyl, oxathiolanyl, wherein the substituent or substituents are selected from the group consisting of methyl, F, Cl, Br, I, NO 2, CN, NH 2, OCH 2 X, CH 2 X, CX 3, CH 2 CH 2 X, OH, wherein X is selected from the group consisting of H, F, Cl, Br, I, R 4, R 5, R 6, R 7 are the same or different and selected from the group consisting of H, F, Cl, Br, I, NO 2, CN, NH 2, OCH 3, OH, NHCH 2 CH 3, N(CH 3) 2, R 8 is selected from the group consisting of substituted or unsubstituted phenyl, benzyl, pyridyl, pyrimidinyl, triazinyl, triazinanyl, oxazinyl, oxazinanyl, cycloexanyl, cycloexenyl, cycloexadienyl, pyranyl, oxathianyl, piperidinyl, cyclopentanyl, cyclopentenyl, cyclopentadienyl, pyrrolidinyl, pyrrolyl, furanyl, oxazolidinyl, pyrazolidinyl, thiophenyl, oxathiinyl, oxathiolyl, oxathiolanyl, wherein the substituent or substituents are selected from the group consisting of methyl, F, Cl, Br, I, NO 2, CN, NH 2, OCH 2 X, CH 2 X, CX 3, CH 2 CH 2 X, OH, wherein X is selected from the group consisting of H, F, Cl, Br, I, R 9 is selected from the group consisting of NHR 10, NR 11 R 12, R 10 is selected from the group consisting of C 1 -C 5 alkyl, phenyl, R 11 and R 12 are the same or different and are C 1 -C 5 alkyl. R 1 and R 2 are the same or different and are selected from the group consisting of C 1 -C 5 alkyl, phenyl, methylphenyl, R 3 is selected from the group consisting of CH 2 R 8, CH 2 CH 2 R 8, CH=CHR 8, CH 2 CH 2 CH 2 R 8, CH 2 CH=CHR 8, CH=CHCH 2 R 8, CH=CH-OR 8, CH 2 -OR 8, CH 2 CH 2 -OR 8, CH=CH-NHR 8, CH 2 -NHR 8, CH 2 CH 2 -NHR 8, CH=CH-SR 8, CH 2 -SR 8, CH 2 CH 2 -SR 8, substituted or unsubstituted phenyl, benzyl, pyridyl, pyrimidinyl, triazinyl, triazinanyl, oxazinyl, oxazinanyl, cycloexanyl, cycloexenyl, cycloexadienyl, pyranyl, oxathianyl, piperidinyl, cyclopentanyl, cyclopentenyl, cyclopentadienyl, pyrrolidinyl, pyrrolyl, furanyl, oxazolidinyl, pyrazolidinyl, thiophenyl, oxathiinyl, oxathiolyl, oxathiolanyl, wherein the substituent or substituents are selected from the group consisting of methyl, F, Cl, Br, I, NO 2, CN, NH 2, OCH 2 X, CH 2 X, CX 3, CH 2 CH 2 X, OH, wherein X is selected from the group consisting of H, F, Cl, Br, I, R 4, R 5, R 6, R 7 are the same or different and selected from the group consisting of H, F, Cl, Br, I, NO 2, CN, NH 2, OCH 3, OH, NHCH 2 CH 3, N(CH 3) 2, R 8 is selected from the group consisting of substituted or unsubstituted phenyl, benzyl, pyridyl, pyrimidinyl, triazinyl, triazinanyl, oxazinyl, oxazinanyl, cycloexanyl, cycloexenyl, cycloexadienyl, pyranyl, oxathianyl, piperidinyl, cyclopentanyl, cyclopentenyl, cyclopentadienyl, pyrrolidinyl, pyrrolyl, furanyl, oxazolidinyl, pyrazolidinyl, thiophenyl, oxathiinyl, oxathiolyl, oxathiolanyl, wherein the substituent or substituents are selected from the group consisting of methyl, F, Cl, Br, I, NO 2, CN, NH 2, OCH 2 X, CH 2 X, CX 3, CH 2 CH 2 X, OH, wherein X is selected from the group consisting of H, F, Cl, Br, I, R 9 is selected from the group consisting of NHR 10, NR 11 R 12, R 10 is selected from the group consisting of C 1 -C 5 alkyl, phenyl, R 11 and R 12 are the same or different and are C 1 -C 5 alkyl.