Compounds of formula I are provided: R1 is an alkoxy or O(CH2)pX, p is an integer from 2 to 3 and X is OH, NH2, or CO2H, m is an integer from 0 to 5, n is an integer from 0 to 5, each R2 is independently selected from hydrogen, alkenyl, hydroxyalkyl, alkoxymethyl, heterocyclyl, hetereocyclylmethyl, amino, amido, hydroxamido, any of which may be optionally substituted with one or more of acyl, alkyl, alkoxy, hydroxyalkyl, or halogen, each R3 is independently selected from hydrogen, halogen, alkyl, alkenyl, carboxy, hydroxymethyl, amido, and at least one of R2 and R3 is not hydrogen.