Steroids reference standards

A steroid is a biologically active organic compound with four rings arranged in a specific molecular configuration. Steroids have two principal biological functions: as important components of cell membranes that alter membrane fluidity; and as signaling molecules. Hundreds of steroids are found in plants, animals and fungi. All steroids are manufactured in cells from the sterols lanosterol (opisthokonts) or cycloartenol (plants).

Lanosterol and cycloartenol are derived from the cyclization of the triterpene squalene. The steroid core structure is typically composed of seventeen carbon atoms, bonded in four "fused" rings: three six-member cyclohexane rings (rings A, B and C in the first illustration) and one five-member cyclopentane ring (the D ring). Steroids vary by the functional groups attached to this four-ring core and by the oxidation state of the rings.

Sterols are forms of steroids with a hydroxy group at position three and a skeleton derived from cholestane.: 1785f  Steroids can also be more radically modified, such as by changes to the ring structure, for example, cutting one of the rings. Cutting Ring B produces secosteroids one of which is vitamin D3.

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CS-E-02933 Aspafilioside A Steroids
CS-E-02935 Aspafilioside C Steroids
CS-O-43529 Bis-(4-nitrophenyl)glutarate Steroids
CS-O-43527 Bis-(4-nitrophenyl)pimelate Steroids
CS-ZG-37545 Boldenone Acetate Steroids
CS-C-00891 Desmosterol Steroids
CS-TB-37441 Desmosterol Sulfate Steroids
CS-O-43578 E-17-Deacetylnorgestimate Steroids
CS-O-43676 epi-Hydrocortisone 11,21-diacetate Steroids
CS-O-43648 Estra-1,3,5(10),8-tetraene-3,17a-diol Steroids
CS-O-43645 Estra-5(10),9(11)-diene-3,17-dione Steroids
CS-O-43467 Kanosamine hydrochloride Steroids
CS-O-43583 Methyl 2-fluoro-5-hydroxybenzoate Steroids
CS-O-43522 Methyl glycyrrhetinate Steroids
CS-O-43619 N6-Cyclopentyl-9-methyladenine Steroids
CS-O-43524 Norethynodiol 3-monoacetate Steroids
CS-O-43684 Pregnene-3b-ol-20-one Steroids
CS-O-43579 Z-17-Deacetylnorgestimate Steroids
CS-O-43530 (±)-6-Hydroxy-ethynylestradiol Steroids
CS-TB-15320 (17ß)- 3,11-Dioxoandrosta-1,4-diene-17-carboxylic Acid Steroids
CS-O-43633 (20beta)-3,11-Dioxo-olean-12-en-29-oic acid Steroids
CS-TB-41759 (6alpha,9beta,11beta,16alpha)-9,11-Epoxy-17,21-dihydroxy-6,16-dimethylpregna-1,4-diene-3,20-dione Steroids
CS-O-43585 1-[Bis(2,3,4,5,6-pentachlorophenyl)methyl]-2,3,4,5,6-pentachlorobenzene Steroids
CS-O-43642 13-Ethyl-3-methoxy-gona-1,3,5(10)-trien-17b-ol Steroids
CS-TB-69829 16beta-Hydroxystanozolol Steroids
CS-TA-00729 17a-Acetoxy-6-hydroxymethyl-3,20-dioxo-19-nor-pregna-4,6-diene Steroids
CS-O-43601 17b-Methyl-estra-1,3,5(10)-trien-3-ol Steroids
CS-O-43525 19-Iodo-cholesterol Steroids
CS-TB-72482 3β-17-Imino-androst-5-en-3-ol Acetate Dimer Steroids
CS-O-43687 3-O-Methyl-2-hydroxyestrone Steroids
CS-O-43730 4-Benzyloxy-3,5-dichlorobenzoic acid Steroids
CS-O-43674 6a,9-Difluoro-11b,17-dihydroxy-16a-methyl-pregna-1,4-diene-3,20-dione Steroids
CS-TB-69841 6-a-Hydroxy Stanozolol Steroids
CS-TB-70993 6α-Hydroxy Testosterone Steroids
CS-O-43620 9-Benzyl-N,N-dimethyl-9H-purin-6-amine Steroids