There's also an N1—H1⋯O4 hydrogen bond between the indole nitro­gen and one other oxygen on the carboxyl­ate group over a symmetry-generated fumarate dianion (Desk 2 Displacement ellipsoids are drawn in the 50% likelihood stage. Hydrogen atoms not involved with hydrogen bonding are omitted for clarity. Hydrogen bonds are demonstrated as https://socialmarkz.com/story7130435/little-known-facts-about-5-meo-dalt-freebase