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Praziquantel

Athanor · official

C19H24N2O2 · 312.4 g/mol

IUPAC name: 2-(cyclohexanecarbonyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one

Also called Biltricide, anthelmintic, schistosomiasis, PZQ

Drugs
Open in Athanor
The structure of Praziquantel
Drawn from its SMILES with RDKit
HazardsHarmful to aquatic life with long lasting effects

Names and identifiers

IUPAC name
2-(cyclohexanecarbonyl)-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one
Synonyms
Biltricide, anthelmintic, schistosomiasis
+ 38 more

PZQ, Droncit, Embay 8440, Praziquantelum, Cysticide, DTXSID9021182, 2-(cyclohexylcarbonyl)-1,2,3,6,7,11b-hexahydro-4H-pyrazino[2,1-a]isoquinolin-4-one, prazicuantel, EMBAY-8440, Praziquantel Tablets, NSC-757285, DTXCID501182, Praziquantel Injection, 4H-Pyrazino(2,1-a)isoquinolin-4-one, 2-(cyclohexylcarbonyl)-1,2,3,6,7,11b-hexahydro-, 2-(Cyclohexylcarbonyl)-1,2,3,6,7,11b-hexahydro-4H-pyrazino(2,1-a)isoquinolin-4-one, Prasiquantel, 6490C9U457, 2-cyclohexanecarbonyl-1H,2H,3H,4H,6H,7H,11bH-piperazino[2,1-a]isoquinolin-4-one, BROADLINE COMPONENT PRAZIQUANTEL, PROFENDER COMPONENT PRAZIQUANTEL, Cisticid, 4H-Pyrazino[2,1-a]isoquinolin-4-one, 2-(cyclohexylcarbonyl)-1,2,3,6,7,11b-hexahydro-, Cestocur, Prazitech, PraziCleanse, GiarCidia Prazi, 2-cyclohexanecarbonyl-1H,2H,3H,4H,6H,7H,11bH-piperazino(2,1-a)isoquinolin-4-one, DACTYMOR, RefChem:55908, Droncit Canine Cestocide, Droncit Feline Cestocide, Durvet Feline Tape Tabs, Tapeworm Dewormer for Cats, CHEBI:45267, P02BA01, TAPEWORM DEWORMER FOR DOGS, Durvet Feline Tape Tabs for Cats, Droncit 5.68% Injectible Solution

Molecular formula
C19H24N2O2
Empirical formula
C19H24N2O2
Molecular weight
312.4 g/mol
Exact mass
312.18378
CAS number
55268-74-1
PubChem CID
4891
Canonical SMILES
C1CCC(CC1)C(=O)N2CC3C4=CC=CC=C4CCN3C(=O)C2
Isomeric SMILES
C1CCC(CC1)C(=O)N2CC3C4=CC=CC=C4CCN3C(=O)C2
InChI
InChI=1S/C19H24N2O2/c22-18-13-20(19(23)15-7-2-1-3-8-15)12-17-16-9-5-4-6-14(16)10-11-21(17)18/h4-6,9,15,17H,1-3,7-8,10-13H2
InChIKey
FSVJFNAIGNNGKK-UHFFFAOYSA-N
Molfile

Names, InChI and the identifiers from PubChem, retrieved 2026-10-14.

Calculated

Heavy atoms
23
Rings
4
Aromatic rings
1
Fraction sp³ carbons (Fsp3)
0.58
H-bond donors
0
H-bond acceptors
2
Rotatable bonds
1
TPSA (Ų)
40.6
Formal charge
0
XLogP3
2.7 PubChem
Complexity
472 PubChem
Stereocenters
0 defined, 1 undefinedCIP: C22: undefined
Double-bond geometry
None specified
Point group
C1 of one 3D conformer with its hydrogens, by Athanor’s engine (as in the app)

Elemental analysis

  • C73.05%
  • H7.74%
  • N8.97%
  • O10.24%

Isotope pattern

100%312.18422%313.1872.6%314.190315.192

Each peak is a nominal mass with its abundance-weighted exact mass, as a percentage of the tallest, from IUPAC natural isotope abundances.

Computed from the structure with RDKit 2026.09 when this page was built, beside PubChem's own computed values from its record; where the two differ, both are shown.

Predicted

log P
2.53 Crippen (Wildman and Crippen 1999)
log S (water solubility)
-3.5 ESOL (Delaney 2004), log mol/L
Synthetic accessibility
2.71 SA score, 1 easy to 10 hard (Ertl and Schuffenhauer 2009)

Drug-likeness: Lipinski’s rule of five

  • Molecular weight ≤ 500: 312.41
  • log P ≤ 5 (Crippen): 2.53
  • H-bond donors ≤ 5: 0
  • H-bond acceptors ≤ 10: 2

Passes all four rules.

¹³C NMR shifts, predicted

Predictions, not measurements; each names its method. A measured log P, where a source reports one, is under Physical properties.

Safety

Most widely reported: 113 company reports to ECHA. Source [1].

  • H412Harmful to aquatic life with long lasting effects (91.2% of reports)

Precautionary statements: P273, P501

Safety data sheets on the supplier’s page: MolCore, ChemDiv, Matrix Scientific.

Always read the supplier’s safety data sheet before working with it.

Spectra

Experimental spectra held by these sources; each link opens the source's own record.

Literature

Reading PubChem, OpenAlex and GSRS…

Bioactivity

Reading ChEMBL…

References

  1. [1]European Chemicals Agency (ECHA) · ECHA legal notice: reuse with acknowledgement · via PubChem · retrieved 2026-10-14
  2. [2]NMRShiftDB · Linked only · via PubChem · retrieved 2026-10-14
  3. [3]SpectraBase · Linked only · via PubChem · retrieved 2026-10-14
  4. [4]NIST Mass Spectrometry Data Center · Linked only · via PubChem · retrieved 2026-10-14
  5. [5]Human Metabolome Database (HMDB) · Linked only · via PubChem · retrieved 2026-10-14
  6. [6]MassBank Europe · Linked only · via PubChem · retrieved 2026-10-14
  7. [7]MassBank of North America (MoNA) · CC BY 4.0 · via PubChem · retrieved 2026-10-14
  8. ·Calculated values: computed by Athanor with RDKit 2026.09 from the structure.
  9. ·Literature on PubChem

Data last updated 2026-10-14.