| prov:value
| - Numerous analogs, homologs, agonists, antagonists and other compounds related to melatonin are known in the art, representatives of which are disclosed in, for example, U.S. Pat. No. 4,880,826, WO 87/00432, WO 89/01472, WO 89/04659, WO 90/14084, and EP 420 064, and by Frohn et al. (Life Sciences, Vol. 27, pp 2043-2046, Pergamon Press) and Clemens et al. (J. Neural Transm., (1986) (supp.) 21:451-45
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