4-Amino-N-(2-(5-hydroxy-1H-indol-3-yl)ethyl)butanamide tartrate hydrate 61059-61-8 Butanamide, 4-amino-N-(2-(5-hydroxy-1H-indol-3-yl)ethyl)-, (R-(R*,R*))-2,3-dihydroxybutanedioate (salt), hydrate (1:1:1)