Alexander Shulgin is known for synthesizing a wide array of psychoactive compounds. Apart from MDMA, Shulgin discovered various other phenethylamines and tryptamines as detailed in his book "PiHKAL: A Chemical Love Story," which stands for "Phenethylamines I Have Known and Loved" 1. This book catalogs several of these substances, providing chemical recipes and personal experiences associated with them.