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LSD (lysergic acid diethylamide) was formerly often referred to as ‘LSD-25’.

If it really is a (Albert Hofmann / Sandoz)'s code name (and not a combination of ‘LSD’ and usual LSD (Delysid) dosage numeral ‘25’ μg; see also Quora: What does the "25" in "LSD-25" mean?), are some other substances from the series LSD-1, LSD-2, … etc., being at a time probably a part of industrial secret, currently already known?

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    $\begingroup$ It was Hofmann's 25th synthesis of the compound-it has nothing to do with dosage. $\endgroup$ – Todd Minehardt Oct 20 '18 at 17:56
  • $\begingroup$ @ToddMinehardt … but it wouldn't make much sense to append serial number to the compound name abbreviation. I share the hypothesis, that in the series, ‘LSD’ means ‘Lysergsäurederivat' rather than ‘Lysergsäurediethylamid’. $\endgroup$ – mykhal Oct 22 '18 at 10:55

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