moleculefinder

Ritonavir

C37H48N6O5S2720.9 g/mol Calculated

Also called Empetus, Norvir, Ritomune and Viekirax.

An antiviral for HIV, now used mostly in tiny amounts to slow the breakdown of other antivirals, including the Paxlovid COVID-19 pill.

Sources and notes
  • The introductionfrom sourceMoleculeFinder curated
  • Other namesfrom sourcePubChem / Wikidata
  • Formula and weightcomputedPubChem
  • 2D drawingcomputedPubChem structure, drawn by RDKit

Where you encounter it

Dispensed on prescription, not sold on a shelf. Ritonavir on the product labels we hold.

Medicines

NorvirAdded by the makerActive ingredient
PaxlovidAdded by the makerActive ingredient

Every product and list we hold

Sources and notes
  • The product labels and their strengthsfrom sourceDailyMed (FDA label)Each label lists the molecule as an ingredient, and an active ingredient at the strength shown.
  • How it gets therefrom sourceMoleculeFinder curatedEach mark is set by hand on our lists, never inferred; a label's ingredient is added by the maker. A row with no mark data says Not marked.
  • The line abovefrom sourceMoleculeFinder curatedFrom the group the molecule belongs to.

Explore its structure

Choose a part to light it up.

A C=O with a nitrogen on one side and an oxygen on the other, half amide and half ester. Water splits it more slowly than it splits an ester.

From: standard chemistry.

Sources and notes
  • The drawingcomputedPubChem structure, drawn by RDKitThe page's one shipped drawing, with the chosen part lit in amber under it.
  • The partscomputedFound by ruleEach part is found by a chemical pattern, never picked by hand atom by atom; its words say where they come from.

Properties and sources

Calculated by PubChem

Molecular formula
C37H48N6O5S2
Molecular weight
720.9 g/mol
XLogP3octanol/water, log units
6
Polar surface areatopological
202 Ų
H-bond donors
4
H-bond acceptors
9
Rotatable bonds
18
Complexity
1040

Reported Hazard label (GHS), ECHA via PubChem

Warning Irritant pictogram (GHS07) and Health hazard pictogram (GHS08); hazard statements H302, H312, H319, H332, H351, H361

Reported Licence

The US Food and Drug Administration licenses Ritonavir for human use (NDA 022417, authorized February 10, 2010), as Norvir. Drugs@FDA

Groups it belongs to

Category
Prescription medicine
Family
Antivirals
Chemical groups
Alcohols, Aromatics, Esters, Amides
Elements
Nitrogen, Sulfur
Hazard classes
Irritant, Health hazard, GHS Warning
SMILESCC(C)C1=NC(=CS1)CN(C)C(=O)N[C@@H](C(C)C)C(=O)N[C…112 characters

PubChem CID 392622 · Wikidata Q422618 · InChIKey NCDNCNXCDXHOMX-XGKFQTDJSA-N · Data refreshed

How MoleculeFinder sources and labels its data

Questions
What is Ritonavir?
An antiviral for HIV, now used mostly in tiny amounts to slow the breakdown of other antivirals, including the Paxlovid COVID-19 pill.
How toxic is Ritonavir?
Its GHS hazard label carries the signal word Warning and the hazard pictograms Irritant and Health hazard. from source
What kind of molecule is Ritonavir?
Ritonavir has the formula C37H48N6O5S2 and a molecular weight of 720.9 g/mol. MoleculeFinder files it under antivirals, in the prescription medicine group. from sourcefrom sourcefrom sourcefrom source
Who licenses Ritonavir as a medicine?
The US Food and Drug Administration licenses Ritonavir for human use (NDA 022417, authorized February 10, 2010), as Norvir. from source
Sources and notes
  • Calculated valuescomputedPubChemComputed from the structure, so no laboratory conditions apply; complexity is PubChem's own structural score.
  • Hazard labelfrom sourceECHA via PubChemThe label combines these classifications.
  • ECHAfrom sourceAttributionSource: European Chemicals Agency, echa.europa.eu.
  • Licencefrom sourceDrugs@FDARead 2026-10-21.
  • Data refreshedfrom sourceMoleculeFinder2026-11-09