There may be also an N1—H1⋯O4 hydrogen bond among the indole nitro­gen and the other oxygen of your carboxyl­ate group with a symmetry-produced fumarate dianion (Desk 2 The synthesis and reliable-point out structure with the fumarate salt in the artificial copyright five-meth­oxy- Crystal constructions are essential for serving to scientists https://edgaruohas.law-wiki.com/708811/5_meo_dalt_freebase_an_overview