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

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