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Alsachim offers you its expertise and know-how in isotope enrichment labeling (13C, 2H, 15N, 18O, 34S) to quantify your compounds by LC-MS/MS analysis. Our teams synthesize labeled internal standards and reference standards, as well as metabolites and building blocks.
415 products
![[reference-standards] (R)-(-)-Cicletanine](https://www.alsachim.com/17556-list_image/-R---Cicletanine.jpg)
![[reference-standards] (R)-Doxazosin](https://www.alsachim.com/19509-list_image/-R-Doxazosin.jpg)
![[reference-standards] (R)-Lercanidipine hydrochloride salt](https://www.alsachim.com/16720-list_image/-R-Lercanidipine-hydrochloride-salt.jpg)
![[reference-standards] (S)-(+)-Cicletanine](https://www.alsachim.com/17555-list_image/-S---Cicletanine.jpg)
![[reference-standards] (S)-Doxazosin](https://www.alsachim.com/19510-list_image/-S-Doxazosin.jpg)
![[reference-standards] (S)-Lercanidipine hydrochloride salt](https://www.alsachim.com/16719-list_image/-S-Lercanidipine-hydrochloride-salt.jpg)
![[metabolites] (±)-4-Hydroxydebrisoquin hemisulfate salt](https://www.alsachim.com/18958-list_image/--4-Hydroxydebrisoquin-hemisulfate-salt.jpg)
(±)-4-Hydroxydebrisoquin hemisulfate salt
Product Number: C5450
CAS number: 62580-84-1
Synonyms: (±)-4-Hydroxydebrisoquin sulfate
![[metabolites] 2'-(2H-Tetrazol-5-yl)-[1,1'-biphenyl]-4-carboxylic acid](https://www.alsachim.com/15824-list_image/2--2H-Tetrazol-5-yl--1-1-biphenyl-4-carboxylic-acid.jpg)
![[metabolites] 3,4-Dehydro-Cilostazol](https://www.alsachim.com/19937-list_image/3-4-Dehydro-Cilostazol.jpg)
![[metabolites] 3-Hydroxy-Guanfacine](https://www.alsachim.com/18588-list_image/3-Hydroxy-Guanfacine.jpg)
![[metabolites] 4'-Hydroxyphenylcarvedilol](https://www.alsachim.com/14983-list_image/4-Hydroxyphenylcarvedilol.jpg)
![[reference-standards] 4-(4-Chlorophenyl)-2-pyrrodinone](https://www.alsachim.com/19663-list_image/4-4-Chlorophenyl-2-pyrrodinone.jpg)
4-(4-Chlorophenyl)-2-pyrrodinone
Product Number: C6852
CAS number: 22518-27-0
Synonyms: Baclofen impurity
![[metabolites] 4-Epitetracycline hydrochloride salt](https://www.alsachim.com/18135-list_image/4-Epitetracycline-hydrochloride-salt.jpg)
![[metabolites] 4-Hydroxy Urapidil](https://www.alsachim.com/19621-list_image/4-Hydroxy-Urapidil.jpg)
![[metabolites] 4-Hydroxymethylambrisentan](https://www.alsachim.com/15277-list_image/4-Hydroxymethylambrisentan.jpg)
![[metabolites] 4-Hydroxynebivolol (Mixture of diastereoisomers)](https://www.alsachim.com/16282-list_image/4-Hydroxynebivolol-Mixture-of-diastereoisomers-.jpg)
![[metabolites] 4-Hydroxypropranolol hydrochloride salt](https://www.alsachim.com/14951-list_image/4-Hydroxypropranolol-hydrochloride-salt.jpg)
![[metabolites] 4-Hydroxypropranolol sulfate potassium salt](https://www.alsachim.com/14997-list_image/4-Hydroxypropranolol-sulfate-potassium-salt.jpg)
![[metabolites] 4-Hydroxypropranolol-β-D-glucuronide](https://www.alsachim.com/17491-list_image/4-Hydroxypropranolol-beta-D-glucuronide.jpg)
4-Hydroxypropranolol-β-D-glucuronide
Product Number: C1441
CAS number: 94731-13-2
Synonyms: 4-Hydroxypropranolol-beta-D-glucuronide
![[metabolites] 4-Hydroxytriamterene](https://www.alsachim.com/19005-list_image/4-Hydroxytriamterene.jpg)
4-Hydroxytriamterene
Product Number: C5561
CAS number: 1226-52-4
Synonyms: 4-Hydroxydyrenium, 2,4,7-Triamino-6-(4-hydroxyphenyl)-pteridine