Lili: You give a great description of LSD metabolism, but I think Techniques really was asking for the break-down products of LSD on prolonged storage, outside the body. If so, then Shulgin tells the story here: Post 322099 (https://www.thevespiary.org/talk/index.php?topic=12786.msg32209900#msg32209900)
(Rhodium: "lumi/iso-LSD", Tryptamine Chemistry)