Steroids for Research: 2700 different androgens, estrogens, cholestins, progestins, bileacids, hormones, and metabolites.

Synthetic or endogeneous, synthesized to purified standards.

Page through our catalog using the category links or search by CAS#, Steraloids Catalogue ID, Trivial Name, or Partial Name.

How can we help?

We are more than happy to help with custom synthesis, bulk chemicals, starting materials, Intermediates, APIs, technical issues, or any other relevant question or request.

eMail sales@steraloids.com

Telephone (US) 1-401 848-5422

Facsimile (US) 1-401-848 5638

Steraloids Naming Convention

This information should help you locate a compound in our catalogue. Please don't hesitate to call us if this is confusing.

Step 1

Begin by choosing a root name for the structure that most closely  mactches the molecule shown. The root name will be prefixed and suffixed to show the differences between the actual compound and the idealised structure.

These 5 examples are the 5 most common structures in our catalogue.

 

Step 2

Now add a root suffix denoting the number of unsaturated (double) bonds from the table. For example: To show that there are no double bonds ass the suffix 'AN'. If there are no items following the root name, or if the rootis followed by a consonant you should add a further "'E'. It helps to remember the suffixes if you think of each double bond adding an 'EN'.

Double Bonds   Suffix
None   Add '-an' or '-ane'
1 think 'EN' Add an 'en' or '-ene'
 2  think 'DI-EN'  Add '-adien' or '-adiene'
 3  think 'TRI-EN'  Add '-atrien' or '-atriene
 4  think 'TETRA-EN'  Add '=atetraen' or '-atetraene'
 5  think 'PENTA-EN'  Add '-apentaen' or '-apentaene'
 

Step 3

Having said how many unsaturated bonds there are, now you need to specify where they are.

Bonds are numbered in terms of the lowest number of the two positions, so for example a double bond between two carbons at positions 2 & 3 would simply be labeled '2'. There is no ambiguity in this case, since a bond between 2 & 1 would be labeled '1'.

However, sometines there is the possibility of ambiguity, for example involving double bonds along the ring junctions (positions 5,8,9,10, and 14).

In those cases, the second position should be included in brackets, so a bond between positions 5 & 10 would be labelled as '5(10)' and one between 5 & 6 as '5'.

Ambiguities are most likely to occur amongst Estrogens where the '10' position is missing the usual methyl group.

5α-ANDROSTANE

This compound has no saturated bonds.

4-ANDROSTEN-3α, 17β-DIOL

This compound has a single unsaturated bond between positions 4 & 5.

3,5, -PREGNADIEN-20-ONE

This compound has two unsaturated bonds between positions 3 & 4 and positions  5 & 6. There is no ambiguity with the 5(6) bond, since position 10 is occupied by the methyl group and is therefore unavaialble to form a double bond with position 5.

1,4,9-ANDROSTATRIEN-3, 17-DIONE

This compound has three unsaturated bonds, between positions 1 & 2, positions 4 & 5, and positions 9 & 11. There is no ambiguity with the 9(11) bond, since the methyl group once again occupies position 10.

 1,3,5 (10), 8(9)-ESTRATETRAEN-3-OL-ONE

This compound has four unsaturated bonds between positions 1 & 2, 3 & 4, 5 & 10, and 8&9. The 8(9) bond i specified to remove any ambiguity with possible double bond at 8(14).

 

Step 4

Prefix your compound name with the positions and names for any stuctural elements.

Structural elements include the orientation of methyl groups (α or β), expanded (HOMO) or contracted (NOR) rings, multiple structural omissions, e.g. missing side-chains from cholan- and cholest- compounds (BISNOR), and broken rings (SECO).

If necessary, to avoid confusion with unsaturated bond numberings, bracket the positions of orientative α's or β's as in these examples:

-PREGNANE

5α indicates that the hydrogen at 5 is in the α orientation - effectively "into the page" as opposed to β "out of the page". See compound PI800-000.

1, (5α)-ANDROTEN-3, 17 DIONE

Here, the 5α is bracketed to prevent the suggestion of a double bond at 5(6). See compound A4400-000.

D-HOMO-5α-ANDROSTAN-17α-METHYL-3β,17αβ-DIOL

D-homo indicates that the 'D' ring has been expanded to a six-membered ring, renumbered as 13,14,15,16,17,17a, and 18. See compound H4080-000.

19-NOR-4PREGNEN-3,20-DIONE

19-NOR indicates that the c19 is missing. See compound N1500-000.

A-NOR5α-ANDROSTAN-2α,17α-DIETHYNYL-2β,17β-DIOL DIPROPIONATE

A-NOR indicated that the 'A' ring is a five-membered ring, with the carbons renumbered as 1,2,3, and 5. See compound N0100-000.

23,24-BISNOR-5-CHOLENIC ACID-3β-OL

23,24-BISNOR indicates that both the 23 nd 34 carbon atoms of the cholenic sidechain have been removed. See compound B0700-000.
 

Step 5

Then add suffixes that show the positions, orientations, and types of the functional groups(left) or substitured positions in numerical/alphabetical order.

Multiple substitutions and deriviatives are prefixed with a multiplier; DI (x2), TRI (x3), TETR or TETRA (x4), PENT or PENTA (x5).

E.g., DIBROMO, DIONE. TRI-ETHYL, TETRA-FLUORO, PENTA-CHLORO, etc.

AMINO R-NH2
BROMO R-Br
CHLORO R-Cl>
EPOXIDE See C0809-000
ETHYL R-C2H5
ETHYNYL R-C2H
FLUORO R-F
IODO R-I
ETHYKENKETAL SEE A3740-000
METHYLKETAL See A2578-000
METHYL R-CH3
NITRO R-NO2
OL R-OH
ONE R-double bonded O
VINYL R-C2H3