"TIHKAL: The Continuation is a 1997 book written by Alexander Shulgin and Ann Shulgin about a family of psychoactive drugs known as tryptamines. A sequel to PIHKAL: A Chemical Love Story, TIHKAL is an acronym that stands for \"Tryptamines I Have Known and Loved\"."@en . . . . . . "38503252" . . "804"^^ . "TIHKAL: The Continuation"@en . . "0-9630096-9-9" .