“…N-methyltryptamine (QQQAHA: Bergin et al, 1968). There are nine other 4-hydroxytryptamines reported in the literature, the natural product psilocin (PSILIN: Petcher & Weber, 1974), 4-hydroxy-N-methyl-N-isopropyltryptamine as its fumarate (TUFQAP: Chadeayne et al, 2020a) and hydrofumarate (RONSUL: Chadeayne et al, 2019a) salts, 4-hydroxy-N,N-di-n-propyltryptamine as its chloride (WAMGEA: Sammeta et al, 2020) and fumarate (WUCGAF: Chadeayne et al, 2019b) salts, and the four quaternary tryptamines 4-hydroxy-N,N,N-trimethyltryptamine (XUXFAA: Chadeayne et al, 2020c), 4-hydroxy-N,N-dimethyl-N-ethyltryptamine, 4-hydroxy-N,N-dimethylisopropyltryptamine, and 4-hydroxy-N,Ndi-n-propyltryptamine (EDOYIJ, EDOYUV and EDOZIK: Glatfelter et al, 2022a). The reported structures most closely related to compound (2) are indole-3-yl-N-isopropylglyoxalylamide (HUNCID: Mansell et al, 2009), 4-benzyloxyindole-3-yl-N,N-diisopropylglyoxalylamide (RUHYEY: Spaeth et al, 1997) and 4-acetoxyindole-3-yl-N,N-diethylglyoxalylamide (AVUMOT: Wu et al, 2004).…”