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PEAK E

PEAK E structure

CAS No.: 132685-02-0

Chemical Name:: PEAK E

Synonyms: EBT;PEAK E;CONTAMINANT 97;1,1'-ethylidenebis;Tadalafil Impurity Q;Tadalafil Impurity 50 DiHCl;Tadalafil Impurity 21 DiHCl;Tryptophan Related CoMpound A;Tryptophan EP Impurity A 2HCl;Tryptophan Impurity 1 Monomer

CBNumber:: CB3701001

Molecular Formula:: C24H26N4O4

Molecular Weight:: 434.49

MDL Number:: MFCD00132891

MOL File:: 132685-02-0.mol

MSDS File:: SDS

TDS File:: TDS

Last updated:2026-05-28 04:40:01

Product description	Number	Pack Size	Price
Tryptophan Related Compound A Pharmaceutical Secondary Standard; Certified Reference Material	PHR2602	30MG	$700
1,1′-Ethylidenebistryptophan	E2205500	2ea	$175
1,1′-Ethylidenebistryptophan	1700512	15mg	$1420
1,1''-Ethylidene-bis-(L-tryptophan) ≥95%	35804	1mg	$32
1,1''-Ethylidene-bis-(L-tryptophan) ≥95%	35804	5mg	$148
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PEAK E Properties

Melting point	>210°C (dec.)
Boiling point	718.5±60.0 °C(Predicted)
Density	1.41±0.1 g/cm3(Predicted)
storage temp.	0-6°C
solubility	Aqueous Base (Slightly)
form	solid
pka	1.95±0.10(Predicted)
color	Pale Beige to Brown
Stability	Decomposes under acidic condition, Hygroscopic
Major Application	pharmaceutical (small molecule)
InChIKey	DETVQFQGSVEQBH-PMACEKPBSA-N
SMILES	C(N1C2=C(C(=C1)C[C@@H](C(O)=O)N)C=CC=C2)(N1C2=C(C(=C1)C[C@@H](C(O)=O)N)C=CC=C2)C
FDA UNII	XP857D0YL2
UNSPSC Code	41116107
NACRES	NA.24

SAFETY

Risk and Safety Statements

Symbol(GHS)

GHS07

Signal word

Warning

Hazard statements

H302-H315-H319-H335

Precautionary statements

P261-P264-P270-P271-P280-P301+P312-P330-P302+P352-P321-P304+P340-P305+P351+P338-P332+P313-P362+P364-P337+P313-P403+P233-P405-P501

WGK Germany

WGK 3

HS Code

2933997500

Storage Class

11 - Combustible Solids

NFPA 704

	0
2		0

PEAK E price More Price(24)

Manufacturer	Product number	Product description	CAS number	Packaging	Price	Updated	Buy
Sigma-Aldrich	PHR2602	Tryptophan Related Compound A Pharmaceutical Secondary Standard; Certified Reference Material	132685-02-0	30MG	$700	2026-04-30	Buy
Sigma-Aldrich	E2205500	1,1′-Ethylidenebistryptophan	132685-02-0	2ea	$175	2026-04-30	Buy
Sigma-Aldrich	1700512	1,1′-Ethylidenebistryptophan	132685-02-0	15mg	$1420	2026-04-30	Buy
Cayman Chemical	35804	1,1''-Ethylidene-bis-(L-tryptophan) ≥95%	132685-02-0	1mg	$32	2026-04-30	Buy
Cayman Chemical	35804	1,1''-Ethylidene-bis-(L-tryptophan) ≥95%	132685-02-0	5mg	$148	2026-04-30	Buy

Product number	Packaging	Price	Buy
PHR2602	30MG	$700	Buy
E2205500	2ea	$175	Buy
1700512	15mg	$1420	Buy
35804	1mg	$32	Buy
35804	5mg	$148	Buy

PEAK E Chemical Properties,Uses,Production

Uses

1,1’-Ethylidenebis[L-tryptophan] is a L-tryptophan (T947210) contaminant found in the peripheral blood mononuclear cells from patients with functional somatic syndromes.

PEAK E Preparation Products And Raw materials

Raw materials

Preparation Products

PEAK E Suppliers

Global( 82)Suppliers

Supplier	Tel	Email	Country	ProdList	Advantage
BOC Sciences	+1-631-485-4226	inquiry@bocsci.com	United States	19936	58
SIMAGCHEM CORP	+86-5922680277 +86-13806087780	sale@simagchem.com	China	17346	58
Nextpeptide Inc	+86-0571-81612335 +8613336028439	sales@nextpeptide.com	China	19908	58
ShenZhen Trendseen Biological Technology Co.,Ltd.	13417589054	trendseenbio@gmail.com	China	11680	58
HANGZHOU LEAP CHEM CO., LTD.	+86-571-87711850 +86-15355479329	market18@leapchem.com	China	43333	58
XIAMEN AMITY INDUSTRY AND TRADE CO., LTD.	+8618950047208	ellena@amitychem.com	China	43414	58
Sinco Pharmachem (ShenZhen) R&D Co., Ltd.	+86-18603013401	jack.lin@sincopharmachem.com	China	10000	58
QUALITY CONTROL SOLUTIONS LTD.	+86-0755-66853366 +8613670046396	export03@qcsrm.com	China	24342	58
Changzhou Xianglong Pharmaceutical Technology Co., LTD	18661161657	sales@xianglongpharm.com	China	10000	58
J & K SCIENTIFIC LTD.	18210857532 18210857532	jkinfo@jkchemical.com	China	96815	76

Supplier	Advantage
BOC Sciences	58
SIMAGCHEM CORP	58
Nextpeptide Inc	58
ShenZhen Trendseen Biological Technology Co.,Ltd.	58
HANGZHOU LEAP CHEM CO., LTD.	58
XIAMEN AMITY INDUSTRY AND TRADE CO., LTD.	58
Sinco Pharmachem (ShenZhen) R&D Co., Ltd.	58
QUALITY CONTROL SOLUTIONS LTD.	58
Changzhou Xianglong Pharmaceutical Technology Co., LTD	58
J & K SCIENTIFIC LTD.	76

132685-02-0(PEAK E)Related Search:

QBWNUEJPRUVNTD-FOIQADDNSA-N (6R,trans)-6-(3,4-dihydroxyphenyl)-2,3,6,7,12,12a-hexahydro-2-Methyl-pyrazino[1',2':1,6]pyrido[3,4-b]indole-1,4-dione Piperonyl aldehyde Tadalafil Impurity 44 Tadalafil Impurity 47

BENZHYDRYL 6,6-DIHYDROPENICILLIC ACID 1-OXIDE[TAZOBACTAM INTERMEDIATE] Tadalafil Impurity 49 HCl (1S,3S)-1-(1,3-Benzodioxol-5-yl)-2-(2-chloroacetyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylic Acid Methyl Ester Tadalafil EP IMpurity G Tadalafil Impurity 11

Tadalafil Impurity 39 Tadalafil Impurity 62 Tadalafil Impuirty 16 Tadalafil Impurity 25 (Mixture of Diastereomers) (1R,3R)-Methyl 1-(benzo[d][1,3]dioxol-5-yl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylate hydrochloride

(1S,3R)-1-Benzo[1,3]dioxol-5-yl-2-(2-chloro-acetyl)-2,3,4,9-tetrahydro-1H-b-carboline-3-carboxylic Acid Methyl Ester Tadalafil iMpurity E Tadalafil Spiro-urethane Impurity (EP Impurity F)

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1,1'-ETHYLIDENE-BIS(L-TRYPTOPHAN) 1,1'-ETHYLIDENE-BIS(L-TRYTOPHAN) PEAK E CONTAMINANT 97 Tryptophan Related Compound A (15 mg) (1,1'-ethylidene-bis-(L-tryptophan)) Tryptophan Related CoMpound A Tadalafil Impurity Q 1,1'-ethylidenebis Tadalafil Impurity 50 DiHCl L-Tryptophan,1,1'-ethylidenebis 1,1'-ethylidenebis 3,3'-[Ethylidenebis(1H-indole-1,3-d 1,1'-Ethylidenebistryptophan CRS (2S,2'S)-3,3'-(1,1'-(Ethane-1,1-diyl)bis(1H-indole-3,1-diyl))bis(2-aminopropanoic acid) Tadalafil Impurity (1,1?'-thylidenebistryptophan) Tryptophan Related Compound A(Secondary Standards traceble to USP) Tryptophan Related Compound A (1,1''-ethylidene-bis(L-tryptophan)) (1700512) Tryptophan USP Related Compound A Tryptophan EP Impurity A(Tryptophan USP Related Compound A) 1,1’-Ethylidenebis[L-tryptophan Tryptophan EP Impurity A 2HCl 3,3'-[Ethylidenebis(1H-indole-1,3-diyl)]bis[(2S)-2-aminopropanoic] Acid (1,1'-Ethylidenebistryptopha 1，1’-Ethylidenebis[L-tryptophan]（EBT） Tadalafil Impurity 21 DiHCl Tryptophan Impurity 1 Monomer EBT Tryptophan EP Impurity A (Tadalafil Impurity 21) https://www.chemicalbook.com/ProdSupplierGNCB3701001.htm 132685-02-0 Amino Acids & Derivatives, Pharmaceuticals, Intermediates & Fine Chemicals