What other records share CAS 55921-65-8?

CAS 55921-65-8 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

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InventoryRef 5878817/11/2016

PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE

2,4-Pyrimidinediamine, 6-(1-pyrrolidinyl)-, 3-oxide

PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Regulatory evidence by market

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Market	Evidence status	Records	Source language
European Union	Source mapped Inventory entry; no linked annex rule	0	English and EU languages
Great Britain	Source mapped Official source mapped; ingredient rule not imported	0	English
Canada	Source mapped Official source mapped; ingredient rule not imported	0	English and French
New Zealand	Source mapped Official source mapped; ingredient rule not imported	0	English
ASEAN	Source mapped Official source mapped; ingredient rule not imported	0	English and national languages
China	Source mapped Official source mapped; ingredient rule not imported	0	Chinese with selected English material
Japan	Source mapped Official source mapped; ingredient rule not imported	0	Japanese; official English translation available
South Korea	Evidence linked Prohibited Open this evidence	1	Korean with some English names
United States	Source mapped Official source mapped; ingredient rule not imported	0	English
Australia	Source mapped Official source mapped; ingredient rule not imported	0	English
Brazil	Source mapped Official source mapped; ingredient rule not imported	0	Portuguese with INCI crosswalks
India	Source mapped Official source mapped; ingredient rule not imported	0	English and Hindi
Saudi Arabia	Source mapped Official source mapped; ingredient rule not imported	0	Arabic and English

Chemical identity and properties

PubChem 2D chemical structure for CAS 55921-65-8

CAS 55921-65-8PubChem CID 15556995

Triaminodil

IUPAC name: 3-hydroxy-2-imino-6-pyrrolidin-1-ylpyrimidin-4-amine

Molecular formula: C8H13N5O
Molecular weight: 195.22 g/mol
Exact mass: 195.11201006 Da
XLogP3: 0.9
Topological polar surface area: 88.9 Å²
Hydrogen-bond donors: 3
Hydrogen-bond acceptors: 3
Covalent units: 1
Defined stereocentres: 0

Also known as

PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE2,4-Pyrimidinediamine, 6-(1-pyrrolidinyl)-, 3-oxide23GGI87A7FRefChem:871104PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE [INCI]FMVJDYVWXJHAFZ-UHFFFAOYSA-NKopyrrol2,6-diamino-4-(pyrrolidin-1-yl)pyrimidine 1-oxide

9 more reported names

2,4-diamino-6-pyrrolidinopyrimidine 3-oxide3-Oxy-6-pyrrolidin-1-yl-pyrimidine-2,4-diamine2,6-diamino-4-(pyrrolidin-1-yl)pyrimidine1-oxide2,6-diamUNII-23GGI87A7FBS-532854-Pyrrolidine 2,6-diaminopyrimidine 1-oxide2,6-Diamino-4-(1-pyrrolidinyl)pyrimidine 1-Oxide3-hydroxy-2-imino-6-pyrrolidin-1-yl-pyrimidin-4-amine

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID701021789

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE

INCI name

PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE

Description

2,4-Pyrimidinediamine, 6-(1-pyrrolidinyl)-, 3-oxide

Record provenance

Inventory reference: 58788
Imported identity: PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE
Source update: 17/11/2016

European Commission CosIng source notes

Annex records for PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE

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Key data

CAS

55921-65-8

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Restriction

—

Function

HAIR CONDITIONING: Enhancing the appearance and feel of hair. Leaving the hair easy to comb, supple, soft and shiny and/or imparting volume, lightness, gloss, texture, etc.
HAIR WAVING OR STRAIGHTENING: Modifying the chemical structure of the hair, allowing it to be set in the style required (permanent waves or hair straightening).

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#23763 · PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE

Ingredients with overlapping formulation functions

POLYVINYL BENZYLIMIDAZOLINIUM CHLORIDEADHESIVE, ANTIMICROBIAL, BINDING, HAIR CONDITIONING, HAIR WAVING OR STRAIGHTENING, SURFACE MODIFIER

POTASSIUM METABISULFITEHAIR WAVING OR STRAIGHTENING, PRESERVATIVE, REDUCING

POTASSIUM SULFITEANTIOXIDANT, HAIR WAVING OR STRAIGHTENING, PRESERVATIVE, REDUCING

POTASSIUM THIOGLYCOLATEDEPILATORY, HAIR WAVING OR STRAIGHTENING

RHODIOLA SACHALINENSIS EXTRACTHAIR CONDITIONING, HAIR WAVING OR STRAIGHTENING, SKIN CONDITIONING

S-GLYOXYLOYL ACETYL CYSTEINEHAIR WAVING OR STRAIGHTENING

SESAMUM SESAMOIDES LEAFANTI-SEBORRHEIC; ANTIOXIDANT; HAIR CONDITIONING; HAIR FIXING; HAIR WAVING OR STRAIGHTENING

SODIUM BISULFITEANTIOXIDANT, HAIR WAVING OR STRAIGHTENING, PRESERVATIVE, REDUCING

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicals PubChem PUG REST EU Safety Gate cosmetic product alerts ECHA CHEM US EPA CompTox Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal

How PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE appears in the CosIng inventory

The CosIng inventory lists PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE is also tagged with 2 cosmetic functions in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE carries the following function designation(s):

CAS 55921-65-8 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Source note for PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE

This page reproduces the CosIng inventory entry for PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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