1. A compound, or a pharmaceutically acceptable salt thereof, represented by formula II: wherein, independently for each occurrence, L is —C(═O)R 3 , —C(═O)[C(R 1 ) 2 ] p R 3 , —C(═O)[C(R 1 ) 2 ] p C(═O)R 3 , —[C(R 1 ) 2 ] p C(═O)R 3 , —C(═O)[C 1-10 alkylene]R 3 , —[C 1-10 alkylene]C(═O)R 3 or —C(═O)[C 1-10 alkylene]C(═O)R 3 ; R 1 is hydrogen, halo, azido, alkyl, haloalkyl, perhaloalkyl, fluoroalkyl, perfluoroalkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, heteroaryl, aralkyl, heteroaralkyl, hydroxy, alkoxy, aryloxy, heteroaryloxy, aralkyloxy, heteroaralkyloxy, amino, alkylamino, arylamino, acylamino, heteroarylamino, nitro, sulfhydryl, imino, amido, phosphonate, phosphinate, acyl, carboxyl, oxycarbonyl, acyloxy, silyl, thioether, sulfo, sulfonate, sulfonyl, sulfonamido, formyl, cyano, or isocyano; R 4 is hydrogen, halo, azido, alkyl, haloalkyl, perhaloalkyl, fluoroalkyl, perfluoroalkyl, aralkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, aryl, heteroaryl, aralkyl, heteroaralkyl, hydroxy, alkoxy, aryloxy, heteroaryloxy, aralkyloxy, heteroaralkyloxy, amino, alkylamino, arylamino, acylamino, heteroarylamino, nitro, sulfhydryl, imino, amido, phosphonate, phosphinate, acyl, carboxyl, oxycarbonyl, acyloxy, silyl, thioether, sulfo, sulfonate, sulfonyl, sulfonamido, formyl, cyano, isocyano, —OR 5 , —SR 5 , —N(R 5 ) 2 , or —(C(R 1 ) 2 ) q C(R 1 ) 3 ; R 5 is hydrogen, alkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, aralkyl, heteroaralkyl, acyl, or —(C(R 1 ) 2 ) q C(R 1 ) 3 ; R 7 is halo, hydroxy, alkoxy, aralkyloxy, heteroaralkyloxy, acyl, or acyloxy; p is 1-10 inclusive; and q is 0-10 inclusive.