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© Melvin Olsson 2025–2026
Data: IAEA & PubChem

Tisopurine

C₅H₄N₄S·152.180 g/mol·CID 135445058

IUPAC: 1,7-dihydropyrazolo[5,4-d]pyrimidine-4-thione

Also known as: 5334-23-6, Thiopurinol, Tisopurina, 4-Mercaptopyrazolo[3,4-d]pyrimidine, Tisopurinum (+14 more)

2D structure of Tisopurine

Molecular Structure

Molecular Propertiesmass · H-bonds · stereo

Molecular Weight

152.180g/mol

Exact Mass

152.015667Da

Monoisotopic Mass

152.015667Da

XLogP

0.0

Polar Surface Area

85.2Ų

Complexity

190

Formal Charge

0

H-Bond Donors

2

H-Bond Acceptors

2

Rotatable Bonds

0

Heavy Atoms

10

Stereo Centers

0

Bond Stereo

0

Drug-Likeness (Lipinski's Rule of Five)

✓ 152.2 g/mol
MW ≤ 500
✓ 0.0
LogP ≤ 5
✓ 2
H-bond donors ≤ 5
✓ 2
H-bond acceptors ≤ 10

Passes all rules — good oral bioavailability predicted

GHS Hazard Classification

Warning
Irritant
Irritant
Hazards
  • H315Causes skin irritation
  • H319Causes serious eye irritation
  • H335May cause respiratory irritation

Source: PubChem GHS Classification. Always consult the SDS for handling.

Chemical IdentifiersSMILES · InChI

InChI

InChI=1S/C5H4N4S/c10-5-3-1-8-9-4(3)6-2-7-5/h1-2H,(H2,6,7,8,9,10)

Isomers8 compounds with formula C₅H₄N₄S

2D structure of 3,7-dihydropurine-6-thione

3,7-dihydropurine-6-thione

CID 667490 · 152.2 g/mol

2D structure of 3,7-dihydropurine-2-thione

3,7-dihydropurine-2-thione

CID 3015569 · 152.2 g/mol

2D structure of 5-thiophen-2-yl-2H-tetrazole

5-thiophen-2-yl-2H-tetrazole

CID 235702 · 152.2 g/mol

2D structure of [1,3]thiazolo[5,4-d]pyrimidin-7-amine

[1,3]thiazolo[5,4-d]pyrimidin-7-amine

CID 350611 · 152.2 g/mol

2D structure of 5-thiophen-3-yl-2H-tetrazole

5-thiophen-3-yl-2H-tetrazole

CID 542538 · 152.2 g/mol

2D structure of 7,9-dihydropurine-8-thione

7,9-dihydropurine-8-thione

CID 4265275 · 152.2 g/mol

2D structure of 2-(1H-1,2,4-triazol-5-yl)-1,3-thiazole

2-(1H-1,2,4-triazol-5-yl)-1,3-thiazole

CID 57116692 · 152.2 g/mol

2D structure of 6-amino-2-sulfanylidene-1H-pyrimidine-5-carbonitrile

6-amino-2-sulfanylidene-1H-pyrimidine-5-carbonitrile

CID 2822202 · 152.2 g/mol

External Resources

PubChem ↗Wikipedia ↗