Ligand profile

PQD

Ligand co-crystallized with a similar protein (Protein Data Bank).

Bound to: KP13_01960 — Dihydrofolate reductase

Via homolog PDB 6cqa UniProt P0ABQ4 Formula C₁₇H₁₆N₆
Mol. weight 304.36 Da
Permeability Check
PAINS Clean

Identifiers

Database identifiers and provenance.

Ligand ID
PQD
PDB
6cqa
UniProt (similar protein)
P0ABQ4
Target protein
KP13_01960

Structure

2D representation rendered from SMILES.

Physicochemical properties

Computed with RDKit from SMILES.

Molecular weight 304.36 Da
LogP (Crippen) 2.38
H-bond donors 3
H-bond acceptors 6
TPSA 108.77 Ų
Rotatable bonds 2
Aromatic rings 4 / 4
Heavy atoms 23
Fraction sp³ C 0.06
Formula C₁₇H₁₆N₆

Drug-likeness

Descriptor-based ADME screening flags from SMILES. These are not experimental toxicity results.

Permeability proxy Check

Estimated from TPSA and LogP only: TPSA ≤ 90 Ų and −1 ≤ LogP ≤ 5 are treated as a favorable small-molecule permeability screen.

  • TPSA ≤ 90 Ų 108.8
  • −1 ≤ LogP ≤ 5 2.38
Lipinski's Rule of Five Pass 0 violations
  • MW ≤ 500 Da 304.4
  • LogP ≤ 5 2.38
  • H-bond donors ≤ 5 3
  • H-bond acceptors ≤ 10 6
Veber's rules Pass
  • Rotatable bonds ≤ 10 2
  • TPSA ≤ 140 Ų 108.8
PAINS Clean

No PAINS structural alerts detected.

Chemical representations

Canonical representations for cheminformatics workflows.

SMILES 
c1cc(cc(c1)N)Cn2ccc3c2ccc4c3c(nc(n4)N)N
InChI 
InChI=1S/C17H16N6/c18-11-3-1-2-10(8-11)9-23-7-6-12-14(23)5-4-13-15(12)16(19)22-17(20)21-13/h1-8H,9,18H2,(H4,19,20,21,22)
InChIKey 
DNYUNVSBWOHMOD-UHFFFAOYSA-N

Provenance

Annotation context from LigQ_2, the internal Target step that collects PDB, ChEMBL, and ZINC ligand evidence.

Method
LigQ sequence
Source
PDB
Binding sites
PF00186

External resources

Open this ligand in third-party databases and cheminformatics tools.

Other ligands for this protein

Quick navigation to other ligands bound to KP13_01960.

PDB 33

Ligands co-crystallized with this protein (structural evidence).

Ligand PDB entry

ChEMBL 100

Compounds with measured inhibitory activity on this target (higher pchembl = more potent).

Compound Potency (pchembl)

ZINC 50

Virtual screening candidates selected by structural similarity to known actives (Tanimoto ≥ 0.5).

Compound Similarity (Tanimoto)