We need help in finding/ purchasing analytical standards that are not available in commercial catalogs:
4-oxo-13-cis retinoic acid and an internal standard for the analysis of Isotretinoin: 3,7-dimethyl-9(2,4-dimethyl-3-furyl)-2,4,6,8-nonatetranoicacid.
Any person who is able to give us information will be appreciated
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