Described herein are compounds of Formula (I): or a salt thereof； wherein: R1 and R5 are independently selected from H, OH and alkoxy； R2-R4 and R6-R8 are independently selected from H, OH, F, Cl, Br, and I； R9 and R10 are independently selected from H, alkyl, alkenyl, alkynyl, and aryl； with the proviso that: at least one of R1 and R5 is OH or alkoxy； and at least one of R2-R4 and R6-R8 is F, Cl, Br or I； compositions comprising said compounds； and methods of making and using the same.
