Melatonin

Melatonin is a substance excreted by the pineal body. It is widely exist in prokaryote,monad,fungi,plants,invertebrate and vertebrate.
Main technical index:[Appearance]White or similar to white crystal powder
　[Identification]Positive reaction
　[Melting point]117-120°C
　[Drying loss]≤0.5%
　[Residue on ignition]≤0.5%
　[Assay] ≥99.0%
Molecular formula:C₁₃H₁₆N₂O₂
Structural formula: