George R. Allen, Vern G. De Vries, E. N. Greenblatt, Ruddy Littell, Francis J. McEvoy, Daniel B. Moran,
2,4-Dimethyl derivatives of 5-methoxy-3-indolylethylamines. New 5-oxygenated tryptamines. Journal of Medicinal Chemistry. ,vol. 16, pp. 949- 951 ,(1973) ,
10.1021/JM00266A021