## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: EC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: n Vitro Biological Assays: Plasmacytoid dendritic cell (pDC)enriched peripheral blood mononuclear cells (PBMCs) were prepared from the blood of a series of human donors (3-5 donors/experiment). PBMCs were isolated using Ficoll-Paque Premium® (GE Healthcare, Chicago Ill.) using methods well known to those in the art. pDCs were magnetically isolated from the total recovered PBMC population using CD304 (BDCA-4/Neuropilin-1) microbeads (Miltenyi Biotec, San Diego Calif.), according to the manufacturer's instructions. Isolated pDCs were then added back to between 1 and 2×108 of the corresponding donor's PBMCs for relative enrichment of this cell type. Duplicate cultures of pDC-enriched PBMCs (2.5×106 cells/mL in RPMI-1640 media plus 10% fetal bovine serum, cultured in 96 well plates) were then incubated for 24 hours with Compound Nos. 63-02, 63-05 through 63-11, 63-13, 63-31, 63-34, 63-38 through 63-47, and their unmodified congener 1-(4-aminomethylbenzyl)-2-butyl-1H-imidazo[4,5-c]quinolin-4-amine (Compound No. 63-00) at 10 serially diluted concentrations covering the range of 0.1 nM to 400 nM. Culture supernatants were collected and interferon-alpha (IFNα) protein levels were measured by ELISA (MabTech, Cincinnati Ohio), according to the manufacturer's instructions.Monocytes were magnetically isolated from PBMCs, prepared as described above, following labeling with CD14 microbeads (Miltenyi Biotec, San Diego Calif.), according to the manufacturer's instructions. Duplicate cultures of monocytes (1×106 cells/mL in RPMI-1640 plus 10% fetal bovine serum, cultured in 96 well plates) were incubated for 24 hours with Compound Nos. 63-02, 63-05 through 63-11, 63-13, 63-31, 63-34, 63-38 through 63-47, and their unmodified congener 1-(4-aminomethylbenzyl)-2-butyl-1H-imidazo[4,5-c]quinolin-4-amine (Compound No. 63-00) at 10 serially diluted concentrations covering the range of 2 nM to 40 μM. Culture supernatants were collected and tumor necrosis factor alpha (TNFα) protein levels were measured by ELISA (MabTech, Cincinnati Ohio), according to the manufacturer's instructions.
- Target name: Toll-like receptor 8
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: CCCCCCCCCCC(=O)NCc1ccc(Cn2c(CCCC)nc3c(N)nc4ccccc4c32)cc1
- Properties:
- ChEMBL ID: CHEMBL5975694
- Molecular weight: 527.76
- Heavy atoms: 39
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 4
- TPSA: 85.83
- LogP: 7.7
- Rotatable bonds: 16
- Ring count: 4
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.48
- QED: 0.15

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 5.58
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type EC50; relation =; value 2644; units nM; pChEMBL 5.58; comment 1095064

## Query Molecule B
- Canonical SMILES: CCCCCCCCCCCCCCCCNCc1ccc(Cn2c(CCCC)nc3c(N)nc4ccccc4c32)cc1
- Properties:
- ChEMBL ID: CHEMBL5977022
- Molecular weight: 583.91
- Heavy atoms: 43
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 4
- TPSA: 68.76
- LogP: 10.13
- Rotatable bonds: 22
- Ring count: 4
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.58
- QED: 0.09

## Molecule Similarity
- Weighted Tanimoto: 0.73

Answer: 5.51