CD and GO contributed equally to this work. SB, CD, and MP conceived the study. AFe, MB, DR, BH, and GR designed and performed synthesis of NRB-AF12. CD, GO, GM, FF, AFo, GC, and SD designed and performed experiments. SB, CD, and GO analyzed and interpreted data. SB, CD, GO, DR, and BH wrote the manuscript. All authors approved the final version of the manuscript.