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.