Patent ID: 7517987

Claim:
A compound according of formula IA: where R 1 is hydrogen, CN, CHN 2 , R, or —CH 2 Y; R is an aliphatic group, a substituted aliphatic group, an aryl group, a substituted aryl group, an aralkyl group, a substituted aralkyl group, a non-aromatic heterocyclic group or a substituted non-aromatic heterocyclic group; Y is —OR, —SR, —OC═O(R), or —OPO(R 8 )(R 9 ); R 8 and R 9 are each independently selected from R or OR; R 2 is CO 2 H, CH 2 CO 2 H, or esters or salts thereof; R 3 is hydrogen or a C 1-6 straight chained or branched alkyl; each of R 4 -R 6 is independently selected from hydrogen, halo, R, OR, SR, aryl, substituted aryl, OH, NO 2 , CN, NH 2 , NHR, N(R) 2 , NHCOR, NHCONHR, NHCON(R) 2 , NRCOR, NHCO 2 R, CO 2 R, CO 2 H, COR, CONHR, CON(R) 2 , S(O) 2 R, SONH 2 , S(O)R, SO 2 NHR, or NHS(O) 2 R; and R 7 is selected from hydrogen, halo, R, OR, SR, aryl, substituted aryl, OH, CN, CO 2 R, CO 2 H, COR, CONHR, CON(R) 2 , S(O) 2 R, SONH 2 , S(O)R, or SO 2 NHR.