Patent ID: 7078435

Claim:
A compound of the following formula: wherein R 1 –R 21 are selected from the group consisting of H, C 1 –C 4 alkyl group, OH, NH 2 , SH and a halogen, wherein the halogen is selected from the group consisting of fluorine, chlorine, bromine, and iodine; R 22 and R 23 are selected from H, S, O, and N—Y, Y is selected from H, C 1 –C 4 alkyl group, OH, NH 2 , SH or a halogen, wherein the halogen is selected from the group consisting of fluorine, chlorine, bromine, and iodine, R 24 –R 28 is H or a halogen, X 1 and X 2 are selected from O, S, NH, H 2 , H plus OH or NH 2 , or any combination of H plus one halogen or two halogens when one or more R groups is substituted, and at least one of R 1 –R 21 is halogen, or the alkylene chain of the molecule contains a sulfur in the chain; and wherein the alkylene chain of the molecule contains a nitrogen in the chain, or the alkylene chain of the molecule contains one or more double bonds or triple bonds between the carbon atoms within the chain, or the homoserine lactone portion of the molecule contains a sulfur in the ring.