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CAS 56-69-9

CAS 56-69-9 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 56-69-9
CAS 56-69-9PubChem CID 144

(+-)-5-Hydroxytryptophan

5-hydroxytryptophan is a tryptophan derivative that is tryptophan substituted by a hydroxy group at position 5. It has a role as a neurotransmitter and a human metabolite. — ChEBI

IUPAC name
2-amino-3-(5-hydroxy-1H-indol-3-yl)propanoic acid
Molecular formula
C11H12N2O3
Molecular weight
220.22 g/mol
Exact mass
220.08479225 Da
XLogP3
-1.2
Topological polar surface area
99.3 Ų
Hydrogen-bond donors
4
Hydrogen-bond acceptors
4
Covalent units
1
Defined stereocentres
0

Also known as

5-hydroxytryptophan114-03-45-HTPDL-5-HTPTryptophan, 5-hydroxy-9181P3OI6NCHEBI:281715 Hydroxytryptophan
16 more reported names
2-azaniumyl-3-(5-hydroxy-1H-indol-3-yl)propanoateTryptophan, 5 Hydroxy5-hydroxytryptophan DL-RefChem:905501200-284-8Oxytryptophan5-Hydroxy-DL-tryptophanDL-5-HydroxytryptophanDL-HydroxytryptophanH-DL-Trp(5-OH)-OHD,L-5-hydroxytryptophan5-Hydroxytryptophan DL-form5-hydroxy tryptophanNSC-925235-HTP/5-Hydroxytryptophan(+/-)-5-Hydroxytryptophan
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 56-69-9

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How CAS 56-69-9 is used on this site

CAS 56-69-9 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 56-69-9 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.