Patent US6821963 - 4-Bromo or 4-iodo phenylamino benzhydroxamic acid derivatives and their use ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsPhenylamino benzhydroxamic acid derivatives of formula (I) where R1, R2, R3, R4, R5, and R6 are hydrogen or substituent groups such as alkyl, and where R7 is hydrogen or an organic radical, are