A compound of the formula: wherein: Group A R 1 is wherein X 1 is CR 4 and X 2, X 3, and X 4 are alkoxy (C≤12); and X 5 is hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; R 2 is wherein: Y 1,Y 5, Y 6, Y 7, Y 8, and Y 9 are each independently hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; and Y 2, Y 3, and Y 4 are alkoxy (C≤12); or Group B R 1 is wherein: X 6 is hydrogen or hydroxy; X 7 is O, NH, or C(R 5) 2; X 8, X 9, and X 10 are each hydrogen; X 11 and R 5 are each independently hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; and R 2 is wherein: Y 1, Y 2, Y 4, Y 5, Y 6, Y 7, Y 8, and Y 9 are each independently hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; and Y 3 is alkoxy (C≤12); n is 1-4; and R 3 is hydrogen, alkyl (C≤8), or a substituted alkyl (C≤8); wherein the term "substituted" means that one or more hydrogen atom has been independently replaced by -OH, -F, -Cl, -Br, -I, -NH 2, -NO 2, -CO 2 H, -CO 2 CH 3, -CN, -SH, -OCH 3, -OCH 2 CH 3, -C CH 3, -NHCH 3, -NHCH 2 CH 3, -N(CH 3) 2, -C NH 2, -OC CH 3, or -S 2 NH 2, or a pharmaceutically acceptable salt, thereof. Group A R 1 is wherein X 1 is CR 4 and X 2, X 3, and X 4 are alkoxy (C≤12); and X 5 is hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; R 2 is wherein: Y 1,Y 5, Y 6, Y 7, Y 8, and Y 9 are each independently hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; and Y 2, Y 3, and Y 4 are alkoxy (C≤12); or R 1 is wherein X 1 is CR 4 and X 2, X 3, and X 4 are alkoxy (C≤12); and X 5 is hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; R 2 is wherein: Y 1,Y 5, Y 6, Y 7, Y 8, and Y 9 are each independently hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; and Y 2, Y 3, and Y 4 are alkoxy (C≤12); or Y 1,Y 5, Y 6, Y 7, Y 8, and Y 9 are each independently hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; and Y 2, Y 3, and Y 4 are alkoxy (C≤12); or Group B R 1 is wherein: X 6 is hydrogen or hydroxy; X 7 is O, NH, or C(R 5) 2; X 8, X 9, and X 10 are each hydrogen; X 11 and R 5 are each independently hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; and R 2 is wherein: Y 1, Y 2, Y 4, Y 5, Y 6, Y 7, Y 8, and Y 9 are each independently hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; and Y 3 is alkoxy (C≤12); R 1 is wherein: X 6 is hydrogen or hydroxy; X 7 is O, NH, or C(R 5) 2; X 8, X 9, and X 10 are each hydrogen; X 11 and R 5 are each independently hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; and X 6 is hydrogen or hydroxy; X 7 is O, NH, or C(R 5) 2; X 8, X 9, and X 10 are each hydrogen; X 11 and R 5 are each independently hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; and R 2 is wherein: Y 1, Y 2, Y 4, Y 5, Y 6, Y 7, Y 8, and Y 9 are each independently hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; and Y 3 is alkoxy (C≤12); Y 1, Y 2, Y 4, Y 5, Y 6, Y 7, Y 8, and Y 9 are each independently hydrogen, hydroxy, phosphate, halo, alkyl (C≤12), alkoxy (C≤12), acyloxy (C≤12), heteroaryl (C≤12), acyl (C≤12), alkylamino (C≤12), dialkylamino (C≤12), or a substituted version of any of these groups; and Y 3 is alkoxy (C≤12); n is 1-4; and R 3 is hydrogen, alkyl (C≤8), or a substituted alkyl (C≤8); wherein the term "substituted" means that one or more hydrogen atom has been independently replaced by -OH, -F, -Cl, -Br, -I, -NH 2, -NO 2, -CO 2 H, -CO 2 CH 3, -CN, -SH, -OCH 3, -OCH 2 CH 3, -C CH 3, -NHCH 3, -NHCH 2 CH 3, -N(CH 3) 2, -C NH 2, -OC CH 3, or -S 2 NH 2,