Name: Psilocybin
Chemical Name: 3-[2-(Dimethylamino)ethyl]-1H-indol-4-ol dihydrogen phosphate ester
Alternate Chemical Names: O-phosphoryl-4-hydroxy-N,N-dimethyltryptamine; Indocybin
Chemical Formula: C12H17N2O4P
Molecular Weight: 284.25
Melting Point: 220-228� C (crystals from boiling water)
Melting Point: 185-195� C (crystals from methanol)
pH: 5.2 (in 50% aq ethanol)
LD50: 285 mg/kg i.v.(mice)
LD50: 280 mg/kg i.v.(rats)
LD50: 12.5 mg/kg i.v.(rabbits)
From the Merck Index
from Erowid.com