Patent ID: 7470703

Claim:
A compound according to formula (1) wherein, R 1 is either a C 1-20 hydrocarbon, or an aromatic or heteroaromatic ring that is monocyclic or polycyclic; R 2 is optional and is selected from the group of —N(H)— and carbonyl-containing linking groups; R 3 is selected from the group of H, COOH, NH 2 , a C 1-30 hydrocarbon, an unsubstituted aromatic or hetero-aromatic ring that is monocylic or polycyclic, and hydrocarbon-R 4 where the hydrocarbon is a C 1-30 hydrocarbon; R 4 is selected from the group of COOH, NH 2 , C 5-7 cycloalkyl, an unsubstituted aromatic or hetero-aromatic ring that is monocyclic or polycyclic, or and R 5 , R 6 , R 7 , R 8 , and R 9 are independently selected from the group of H, C 1-6 alkyl, halo, C 1-2 alkylamino, C 1-2 dialkylamino, amido, C 1-2 alkylamido, cyano, nitro, C 1-6 alkoxy, C 1-6 alcohol, carboxyl containing a C 1-6 alkyl, carbonyl containing a C 1-6 alkyl, and an ester containing C 1-6 alkyl group, provided the compound is not a yohimbine dimer.