CAS number

CAS 5543-57-7 warfarin (ISO)

CAS 81-81-2 · CAS 5543-57-7 · CAS 5543-58-8 · EC 201-377-6 · EC 226-907-3 · EC 226-908-9 · Index No 607-056-00-0

Where CAS 5543-57-7 appears: every table entry that prints it among its identifiers, in the newest version of each act this record holds, and every recorded change to those entries. Many entries name a group of substances and print no number, so absence here is not absence from the law. Not legal advice.

Where it appears now

CLP Annex VI section 3, Index No 607-056-00-0

Last changed in the version detected 13 August 2026 · Annex VI on this site

Annex VI section 3, table 1
Index No	Chemical name	EC No	CAS No	Classification		Labelling			Specific Conc. Limits, M-factors and ATEs	Notes
Index No	Chemical name	EC No	CAS No	Hazard Class and Category Code(s)	Hazard statement Code(s)	Pictogram, Signal Word Code(s)	Hazard statement Code(s)	Suppl. Hazard statement Code(s)	Specific Conc. Limits, M-factors and ATEs	Notes
607-056-00-0	warfarin (ISO); 4-hydroxy-3-(3-oxo-1-phenylbutyl)-2H-chromen-2-one; [1] (S)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone; [2] (R)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone [3]	201-377-6 [1] 226-907-3 [2] 226-908-9 [3]	81-81-2 [1] 5543-57-7 [2] 5543-58-8 [3]	Repr. 1A Acute Tox. 1 Acute Tox. 1 Acute Tox. 2 STOT RE 1 Aquatic Chronic 2	H360D H330 H310 H300 H372 (blood) H411	GHS08 GHS06 GHS09 Dgr	H360D H330 H310 H300 H372 (blood) H411		Repr. 1A; H360D: C ≥ 0,003 % STOT RE 1; H372 (blood): C ≥ 0,5 % STOT RE 2; H373 (blood): 0,05 % ≤ C < 0,5 %

CLP Annex VI section 3, table 2, Index No 607-056-00-0

No change to this entry since the first version the record holds, in force 1 December 2010. · Annex VI on this site

Annex VI section 3, table 2
Index No	International Chemical Identification	EC No	CAS No	Classification	Labelling	Concentration Limits	Notes
607-056-00-0	warfarin (ISO); [1] (S)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone; [2] (R)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone [3]	201-377-6 [1] 226-907-3 [2] 226-908-9 [3]	81-81-2 [1] 5543-57-7 [2] 5543-58-8 [3]	Repr. Cat. 1; R61 T; R48/25 R52-53	T R: 61-48/25-52/53 S: 53-45-61		E

REACH Annex XVII appendix 5, Index No 607-056-00-0

Last changed in the version in force 1 March 2018, by Regulation (EU) 2017/1510, the act that change names · Annex XVII on this site

Annex XVII appendix 5, table 1
Substances	Index No	EC No	CAS No	Notes
Warfarin (ISO); 4-hydroxy-3-(3-oxo-1- phenylbutyl)-2H-chromen-2-one; [1] (S)-4-hydroxy-3-(3-oxo- 1-phenylbutyl)-2-benzopyrone; [2] (R)-4-hydroxy-3-(3-oxo- 1-phenylbutyl)-2-benzopyrone [3]	607-056-00-0	201-377-6 [1] 226-907-3 [2] 226-908-9 [3]	81-81-2 [1] 5543-57-7 [2] 5543-58-8 [3]

Look up a number

Type a CAS or EC number, with or without its hyphens, or an Index No into the search box at the top of the page: it reads 50000 as CAS 50-00-0. Every number is also listed by act on the substances page.

Its history

13 August 2026 · amended · CLP Annex VI section 3, Index No 607-056-00-0

Recorded in the version detected 13 August 2026. The change on its version page

Amended entries, Annex VI section 3, table 1
Identifiers	Version	Index No	International Chemical Identification	EC No	CAS No	Classification		Labelling			Specific Conc. Limits, M-factors
Identifiers	Version	Index No	International Chemical Identification	EC No	CAS No	Hazard Class and Category Code(s)	Hazard statement Code(s)	Pictogram, Signal Word Code(s)	Hazard statement Code(s)	Suppl. Hazard statement Code(s)
Index No 607-056-00-0CAS 5543-57-7CAS 5543-58-8CAS 81-81-2EC 201-377-6EC 226-907-3EC 226-908-9	Before	607-056-00-0	warfarin (ISO); [1] (S)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone; [2] (R)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone [3]	201-377-6 [1] 226-907-3 [2] 226-908-9 [3]	81-81-2 [1] 5543-57-7 [2] 5543-58-8 [3]	Repr. 1A STOT RE 1 Aquatic Chronic 3	H360D ~~*~~ H372 H412	GHS08 Dgr	H360D ~~*~~ H372 H412
	After	607-056-00-0	warfarin (ISO); 4-hydroxy-3-(3-oxo-1-phenylbutyl)-2H-chromen-2-one; [1] (S)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone; [2] (R)-4-hydroxy-3-(3-oxo-1-phenylbutyl)-2-benzopyrone [3]	201-377-6 [1] 226-907-3 [2] 226-908-9 [3]	81-81-2 [1] 5543-57-7 [2] 5543-58-8 [3]	Repr. 1A Acute Tox. 1 Acute Tox. 1 Acute Tox. 2 STOT RE 1 Aquatic Chronic 2	H360D H330 H310 H300 H372 (blood) H411	GHS08 GHS06 GHS09 Dgr	H360D H330 H310 H300 H372 (blood) H411		Repr. 1A; H360D: C ≥ 0,003 % STOT RE 1; H372 (blood): C ≥ 0,5 % STOT RE 2; H373 (blood): 0,05 % ≤ C < 0,5 %

1 March 2018 · amended · REACH Annex XVII appendix 5, Index No 607-056-00-0

Recorded in the version in force 1 March 2018, by Regulation (EU) 2017/1510, the act that change names. The change on its version page

Amended entries, Annex XVII appendix 5, table 1
Identifiers	Version	Substances	Index No	EC No	CAS No	Notes
Index No 607-056-00-0CAS 5543-57-7CAS 5543-58-8CAS 81-81-2EC 201-377-6EC 226-907-3EC 226-908-9	Before	~~Warfarin; 4-hydroxy-3-(3-oxo-1-phenylbutyl)coumarin~~	607-056-00-0	201-377-6	81-81-2
	After	Warfarin (ISO); 4-hydroxy-3-(3-oxo-1- phenylbutyl)-2H-chromen-2-one; [1] (S)-4-hydroxy-3-(3-oxo- 1-phenylbutyl)-2-benzopyrone; [2] (R)-4-hydroxy-3-(3-oxo- 1-phenylbutyl)-2-benzopyrone [3]	607-056-00-0	201-377-6[1] 226-907-3 [2] 226-908-9 [3]	81-81-2[1] 5543-57-7 [2] 5543-58-8 [3]

Sources

CLP: every version the record holds; rows read from EUR-Lex consolidated version 02008R1272-20270101, in force 1 January 2027 (external, EUR-Lex)
REACH: every version the record holds; rows read from EUR-Lex consolidated version 02006R1907-20260622, detected 11 September 2026 (external, EUR-Lex)

Watch this substance