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Ideal sources for Wikipedia's health content are defined in the guideline Wikipedia:Identifying reliable sources (medicine) and are typically review articles. Here are links to possibly useful sources of information about Methoxsalen.

PubMed provides review articles from the past five years (limit to free review articles)
The TRIP database provides clinical publications about evidence-based medicine.
Other potential sources include: Centre for Reviews and Dissemination and CDC

VfD results

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This article was nominated for deletion. The result was keep. For details, please see Wikipedia:Votes for deletion/Oxsoralen. -- BD2412 ^talk 17:03, July 17, 2005 (UTC)

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Merged material has copyright problems

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The material recently merged from 8-mop was copied from NIH. Although the content of this site is in the public domain, no acknowledgement was given. I am going to revert the material and let editors here sort out if or how the material should be reinserted and how to reference it properly. The editor who introduced it, In4pharm (talk · contribs), has a record of copyright violation and appears to be editing in order to promote the drugs-about.com website. JonHarder ^talk 02:24, 25 December 2006 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-12-25T02:24:00.000Z","author":"JonHarder","type":"comment","level":1,"id":"c-JonHarder-2006-12-25T02:24:00.000Z-Merged_material_has_copyright_problems","replies":[]}}-->

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Copyright problem removed

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One or more portions of this article duplicated other source(s). The material was copied from: "The-Organic-Chemistry-of-Drug-Synthesis-VOLUME-2-DANIEL-LEDNICER". Infringing material has been rewritten or removed and must not be restored, unless it is duly released under a compatible license. (For more information, please see "using copyrighted works from others" if you are not the copyright holder of this material, or "donating copyrighted materials" if you are.) For legal reasons, we cannot accept copyrighted text or images borrowed from other web sites or published material; such additions will be deleted. Contributors may use copyrighted publications as a source of information, but not as a source of sentences or phrases. Accordingly, the material may be rewritten, but only if it does not infringe on the copyright of the original or plagiarize from that source. Please see our guideline on non-free text for how to properly implement limited quotations of copyrighted text. Wikipedia takes copyright violations very seriously, and persistent violators will be blocked from editing. While we appreciate contributions, we must require all contributors to understand and comply with these policies. Thank you. Elen of the Roads (talk) 17:59, 23 May 2010 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2010-05-23T17:59:00.000Z","author":"Elen of the Roads","type":"comment","level":1,"id":"c-Elen_of_the_Roads-2010-05-23T17:59:00.000Z-Copyright_problem_removed","replies":[]}}-->

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Date / Timeline Issue

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The first section indicates that "In 1970, Nielsen extracted 8-methoxypsoralen" but the last section indicates that the book 'Black Like Me' was written in 1961. How did the author take the substance a decade prior to it being chemically isolated? 2001:569:7D1E:7100:957C:DABD:A601:A051 (talk) 05:32, 10 June 2020 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2020-06-10T05:32:00.000Z","author":"2001:569:7D1E:7100:957C:DABD:A601:A051","type":"comment","level":1,"id":"c-2001:569:7D1E:7100:957C:DABD:A601:A051-2020-06-10T05:32:00.000Z-Date_\/_Timeline_Issue","replies":["c-Anypodetos-2020-06-10T06:39:00.000Z-2001:569:7D1E:7100:957C:DABD:A601:A051-2020-06-10T05:32:00.000Z"]}}-->

Thanks for bringing this up. I've found a paper about the substance being isolated from bishop's weed, dated 1947. --ἀνυπόδητος (talk) 06:39, 10 June 2020 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2020-06-10T06:39:00.000Z","author":"Anypodetos","type":"comment","level":2,"id":"c-Anypodetos-2020-06-10T06:39:00.000Z-2001:569:7D1E:7100:957C:DABD:A601:A051-2020-06-10T05:32:00.000Z","replies":[],"displayName":"\u1f00\u03bd\u03c5\u03c0\u03cc\u03b4\u03b7\u03c4\u03bf\u03c2"}}-->