Patent ID: 7811998

Claim:
A compound according to Formula I wherein R 1 is hydrogen, alkyl, aryl or amido; wherein R 2 is hydrogen; hydroxy or —R 8 —OR 9 , wherein R 8 is a covalent bond or alkyl, and R 9 is C-amido or acyl; or R 2 together with R 3 and the atoms to which they are attached form a heterocyclic ring having 4 to 8 ring members with at least one heteroatom selected from oxygen or nitrogen; wherein R 3 is hydrogen; hydroxy or —R 10 —OR 11 , wherein R 10 is a covalent bond or alkyl, and R 11 is C-amido or acyl; or R 3 together with R 2 and the atoms to which they are attached form a heterocyclic ring having 4 to 8 ring members with at least one heteroatom selected from oxygen or nitrogen; wherein R 4 is hydrogen or methyl; wherein R 5 is hydrogen or alkyl; wherein R 6 is hydrogen, alkyl, alkenyl, alkynyl, aryl, aralkyl, alkoxy, aryloxy, or aralkoxy; wherein X 1 is —O—, —CO—, or —N—; wherein X 2 is —O—, —N—, —NR 18 —, —CR 19 —, or —CO—; wherein R 18 and R 19 are hydrogen, alkyl, alkenyl, or alkynyl; wherein X 4 is —CR 20 —, wherein R 20 is hydrogen, alkyl, alkenyl, or alkynyl; wherein X 5 is —CR 21 —, wherein R 21 is hydrogen, alkyl, alkenyl, or alkynyl; wherein X 6 is —CR 22 —, wherein R 22 is hydrogen, alkyl, alkenyl, alkynyl, alkoxy, aryl, aralkyl, halogen, or nitro; wherein X 8 is —CR 23 — or —N—, wherein R 23 is hydrogen, alkyl, alkenyl, or alkynyl; wherein X 9 is ether; and wherein at least one of X 1 , X 2 , X 4 , X 5 , X 6 , X 8 is not —CR—; wherein n is 1; and wherein R 2 and R 3 are not simultaneously hydroxy.