Ok, finally found the answer myself. Self-help is the best help.
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"It seems like there is a lot of confusion involving Havoc and Epistane due to the different nomenclature conventions adopted by RPN and IBE. The two active compounds are in fact exactly the same. I cannot say anything about relative purity, but the actual PS contained in each is identical.
Havoc: 2a,3a-epithio-17a-methyl-5a-androstan-17b-ol
Epistane: 2a,3a-epithio17a methyl-17b-hydroxy-5a-androstane
Havoc's naming better follows the IUPAC nomenclature conventions, but both accurately describe the same compound. The prefix hydroxy- and the suffix -ol both represent an alcohol functional group (-OH). In the case of havoc/epistane, this alcohol group is found as a substituent on C17 (in the beta (b) configuration).
For example, the alcohol found in liquor, beer, etc. is known as ethanol. The -ol represents the alcohol group. This could also be named hydroxyethane, although it would be unconventional to do so."