Appearance White to pale yellow crystalline powder; odorless with a bitter taste Melting Point 225–230°C Solubility - Water: Highly soluble (200 g/L at 20°C) - Ethanol: Soluble - Chloroform: Slightly soluble - Acetone: Very slightly soluble Optical Rotation Racemic mixture (tetramisole is a 50:50 mixture of S- and R-enantiomers) Stability - Stable in acidic conditions - Degrades under alkaline conditions or prolonged exposure to heat/light