![[reference-standards] Vitamine K2](https://www.alsachim.com/19349-list_image/Vitamine-K2.jpg)
Reference standards
The wide portfolio of Alsachim's reference standards covers a broad range of applications: pharmaceutical, environmental analysis, food and beverages, doping, toxicology and forensic analysis.
8 products
![[reference-standards] Vitamin K1](https://www.alsachim.com/18064-list_image/Vitamin-K1.jpg)
![[reference-standards] Vitamin A](https://www.alsachim.com/16396-list_image/Vitamin-A.jpg)
![[metabolites] 13-cis-Retinoic acid](https://www.alsachim.com/15615-list_image/13-cis-Retinoic-acid.jpg)
![[metabolites] 4-Keto 13-cis-retinoic acid](https://www.alsachim.com/15617-list_image/4-Keto-13-cis-retinoic-acid.jpg)
4-Keto 13-cis-retinoic acid
Product Number: C3165
CAS number: 71748-58-8
Synonyms: 4-Oxo-13-cis-retinoic Acid, 4-Oxo-isotretinoin
![[metabolites] 9-cis-Retinoic acid](https://www.alsachim.com/15618-list_image/9-cis-Retinoic-acid.jpg)
9-cis-Retinoic acid
Product Number: C3167
CAS number: 5300-03-8
Synonyms: Alitretinoin, Panretin, 9-cis-Tretinoin, Panrexin
![[metabolites] all-trans-Retinoic acid](https://www.alsachim.com/15622-list_image/all-trans-Retinoic-acid.jpg)
all-trans-Retinoic acid
Product Number: C3171
CAS number: 302-79-4
Synonyms: Tretinoin, Vitamin A acid
![[metabolites] 9-cis,13-cis-Retinoic acid](https://www.alsachim.com/14926-list_image/9-cis-13-cis-Retinoic-acid.jpg)
9-cis,13-cis-Retinoic acid
Product Number: C3315
CAS number: 5352-74-9
Synonyms: 9,13-Di-cis-retinoic acid, (9-cis,13-cis)-Retinoic acid