Greenleafpharm Cialis CAS#: 171596-29-5 Ref.Standard :Enterprise Standard Description: White or practically White Crystalline Powder Melting Point: 301-303°C Rotation:68~73° Assay: ≥99.0% Tiopronin CAS#: 1953-02-2 Ref.Standard :CP2000 Description: White or practically White Crystalline Powder Melting Point: 95~99°C Assay: ≥98.0% Web: