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.
50 products
![[metabolites] 7-Hydroxymethotrexate](https://www.alsachim.com/14363-list_image/7-Hydroxymethotrexate.jpg)
Product Number: C293
CAS number: 5939-37-7
Synonyms: 7-OHMTX, (S)-2-(4-(((2,4-Diamino-7-hydroxypteridin-6-yl)methyl)(methyl)amino)benzamido)pentanedioic acid, 4-Amino-7-hydroxy-10-methylpteroylglutamic acid, 7-Hydroxyamethopterin
![[reference-standards] Gemcitabine hydrochloride salt](https://www.alsachim.com/15039-list_image/Gemcitabine-hydrochloride-salt.jpg)
Product Number: C1504
CAS number: 122111-03-9
Synonyms: 2',2'-Difluoro-2'-deoxycytidine hydrochloride salt
![[metabolites] Lamivudine Triphosphate triethylammonium salt](https://www.alsachim.com/19382-list_image/Lamivudine-Triphosphate-triethylammonium-salt.jpg)
Product Number: C6095
CAS number: 1187058-42-9
Synonyms: Lamivudine metabolite
![[reference-standards] Methylpregabalin](https://www.alsachim.com/19650-list_image/Methylpregabalin.jpg)
Product Number: C6781
CAS number: 313651-25-1
Synonyms: (3R,4R)-3-(Aminomethyl)-4,5-dimethylhexanoic acid
![[metabolites] Tenofovir alafenamide](https://www.alsachim.com/17013-list_image/Tenofovir-alafenamide.jpg)
Product Number: C6620
CAS number: 379270-37-8
Synonyms: GS-7171 fumarate // [2H6]-N-[[[(1R)-2-(6-Amino-9H-purin-9-yl)-1-methylethoxy]methyl]phenoxyphosphinyl]-1-methylethyl ester-L-alanine fumarate
![[reference-standards] Methotrexate monohydrate](https://www.alsachim.com/14586-list_image/Methotrexate-monohydrate.jpg)
![[reference-standards] Pemetrexed](https://www.alsachim.com/15254-list_image/Pemetrexed.jpg)
![[reference-standards] Levetiracetam](https://www.alsachim.com/15460-list_image/Levetiracetam.jpg)
![[reference-standards] Cytarabine](https://www.alsachim.com/15776-list_image/Cytarabine.jpg)
![[reference-standards] Selurampanel](https://www.alsachim.com/20770-list_image/Selurampanel.jpg)
![[reference-standards] Felbamate](https://www.alsachim.com/20815-list_image/Felbamate.jpg)
![[reference-standards] Perampanel](https://www.alsachim.com/14902-list_image/Perampanel.jpg)
![[reference-standards] Cenobamate, racemic mixture](https://www.alsachim.com/20690-list_image/Cenobamate-racemic-mixture.jpg)
![[reference-standards] trans-Carbamazepine-diol](https://www.alsachim.com/20604-list_image/trans-Carbamazepine-diol.jpg)
![[reference-standards] Brivaracetam](https://www.alsachim.com/20097-list_image/Brivaracetam.jpg)
![[reference-standards] Stiripentol](https://www.alsachim.com/16713-list_image/Stiripentol.jpg)
![[metabolites] 5'-Deoxy-5-fluorocytidine](https://www.alsachim.com/16753-list_image/5-Deoxy-5-fluorocytidine.jpg)
![[metabolites] 2',2'-Difluorodeoxyuridine](https://www.alsachim.com/16755-list_image/2-2-Difluorodeoxyuridine.jpg)
![[reference-standards] Rufinamide](https://www.alsachim.com/16963-list_image/Rufinamide.jpg)
![[metabolites] Tenofovir diphosphate](https://www.alsachim.com/17017-list_image/Tenofovir-diphosphate-salt.jpg)