There may be also an N1—H1⋯O4 hydrogen bond between the indole nitro­gen and the other oxygen with the carboxyl­ate group with a symmetry-produced fumarate dianion (Desk 2 I think that this chemical is most likely regularly forgotten by people a result of the deficiency of data and inconsistency of dosage. https://5-meo-daltfreebase02479.wikigop.com/557786/the_2_minute_rule_for_5_meo_dalt_freebase