Patent ID: 7687482

Claim:
A compound of formula BX1: and salts, esters and hydrates thereof where: Q is M or a negative charge; Z is selected from: M, M 1 , M 2 or M 3 , independently of one another are H, alkyl, —(CH 2 ) p —O—CO—R or —(CH 2 ) p —O—C—R where p is 1 to 6, R is H, optionally substituted alkyl or optionally substituted aryl; M 1 , M 2 or M 3 which are hydrogen may also be in form of a salt (—O − A + , where A + is a cation); X is H, halogen, OH or methyl; n is 1, 2, or 3; R 6 and R 7 , independently of each other and other R 6 and R 7 in the compound, are selected from the group consisting of a hydrogen, a halogen, a —N(R) 2 , or —SR group, an optionally substituted alkyl group, an optionally substituted alkenyl group, an optionally substituted alkoxy group, and an optionally substituted aryl group, where each R, independent of any other R in any listed group, is selected from H, an optionally substituted alkyl group and an optionally substituted aryl group where R 6 and R 7 can be linked together to form a 4-7 member ring; R 1 , R 2 , R 3 and R 4 , independently of one another, are selected from the group consisting of an optionally substituted alkyl group, an optionally substituted alkenyl group, an optionally substituted alkoxy group, and an optionally substituted aryl group wherein any two R 1 -R 3 groups in the same molecule can be linked together to form a 4-7 member ring with the exception that R 1 , R 2 and R 3 are not all methyl groups.