Ligand profile

LBH

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

Bound to: KP13_03495 — Histone deacetylase superfamily protein

Via homolog PDB 5ef8 UniProt F8W4B7 Formula C₂₁H₂₃N₃O₂
Mol. weight 349.43 Da
Permeability High
PAINS Alert

Identifiers

Database identifiers and provenance.

Ligand ID
LBH
PDB
5ef8
UniProt (similar protein)
F8W4B7
Target protein
KP13_03495

Structure

2D representation rendered from SMILES.

Physicochemical properties

Computed with RDKit from SMILES.

Molecular weight 349.43 Da
LogP (Crippen) 3.33
H-bond donors 4
H-bond acceptors 3
TPSA 77.15 Ų
Rotatable bonds 7
Aromatic rings 3 / 3
Heavy atoms 26
Fraction sp³ C 0.19
Formula C₂₁H₂₃N₃O₂

Drug-likeness

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

Permeability proxy High

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 77.2
  • −1 ≤ LogP ≤ 5 3.33
Lipinski's Rule of Five Pass 0 violations
  • MW ≤ 500 Da 349.4
  • LogP ≤ 5 3.33
  • H-bond donors ≤ 5 4
  • H-bond acceptors ≤ 10 3
Veber's rules Pass
  • Rotatable bonds ≤ 10 7
  • TPSA ≤ 140 Ų 77.2
PAINS Alert

Matches PAINS filter: indol_3yl_alk(461). May be a frequent false positive in HTS — review carefully.

Chemical representations

Canonical representations for cheminformatics workflows.

SMILES 
Cc1c(c2ccccc2[nH]1)CCNCc3ccc(cc3)/C=C/C(=O)NO
InChI 
InChI=1S/C21H23N3O2/c1-15-18(19-4-2-3-5-20(19)23-15)12-13-22-14-17-8-6-16(7-9-17)10-11-21(25)24-26/h2-11,22-23,26H,12-14H2,1H3,(H,24,25)/b11-10+
InChIKey 
FPOHNWQLNRZRFC-ZHACJKMWSA-N

Provenance

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

Method
LigQ nearest_k
Source
PDB
Binding sites
PF00850

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_03495.

PDB 45

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

Ligand PDB entry

ChEMBL 55

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)