here's the 1961 paper by Arcamone
et al. (KH2PO4 is potassium dihydrogen phosphate, or monopotassium phosphate, commonly used to prepare pH buffer solution.
MgSO4 * 7H2O is magnesium sulfate heptahydrate, aka epsom salts)
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"Experiments are the only means of attaining knowledge at our disposal. The rest is poetry, imagination." -Max Planck