Supporting information Scaffolds, A building blocks and B building blocks, which were found to be overrepresented in the selected structures from the DOOD are shown below. Figure s-1. The scaffolds that were overrepresented in the selected structures. Figure s-2. The A building blocks that were overrepresented in the selected structures. 2 Figure s-3. The B building blocks that were overrepresented in the selected structures. Upon request, a full list of a SMILES strings for all building blocks used for the virtual library design can be emailed. Please contact the corresponding author. 3 The sequences of all 26 hit structures and their measured average fluorescence values. The structures of the building blocks are found in Chart 2 in the main text. Hit Scaffold 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 5 5 1 2 5 5 4 3 5 4 5 4 5 5 5 5 3 1 5 2 1 3 2 2 5 1 A Building Block B Building Block 3 6 3 3 5 12 3 3 8 6 4 5 9 10 3 1 5 5 7 3 6 6 5 6 3 3 Averaged Fluorescence (FU) 10 10 10 10 10 10 10 10 10 10 10 10 10 10 6 10 10 10 10 6 10 10 10 10 5 7 4 318 269 246 230 225 203 176 171 140 113 101 100 98 97 91 90 83 78 78 76 74 73 72 72 69 69 The NMR spectra of compounds 1 and 3, together with the assignments are shown in the figures s-4 to s-7 shown below. Figure s-4. NMR spectra for compound 1. Figure s-5. NMR assignments for compound 1, Figure s-6. NMR spectra and assignments for compound 2. Figure s-7. NMR assignments for compound 2. Shown below in figures s-8 to s-11 are the analytical HPLC-spectra from the affinitypurification of mAb. A Peak conversion factor of 397362 was used to convert the peak area to mAb concentration in µg/ml. Figure s-8. Analytical HPLC chromatogram from the crude cell feed applied to the column. Figure s-9. Analytical HPLC chromatogram from the flowthrough in the affinity purification. Figure s-10. Analytical HPLC chromatogram from wash in the affinity purification . Figure s-11. Analytical HPLC chromatogram from eluate from the affinity purification.