: Form I can be quantitatively converted into Form II.
Researchers using X-ray powder diffraction (XRPD) and thermal analysis have identified three primary forms: 54757.rar
: Exhibits a unique "catameric" arrangement where carboxylic residues form one-dimensional hydrogen-bonded chains, winding around a short monoclinic axis. 3. Thermal Stability and Phase Conversion : Form I can be quantitatively converted into Form II
Acitretin is a second-generation retinoid and a metabolite of etretinate. While effective for severe psoriasis, its physical properties are highly dependent on the crystallization process. Because different crystalline structures (polymorphs) can change the drug’s solubility and shelf-life, precise characterization is essential for regulatory compliance and patient safety ( ResearchGate ). 2. Characterization of Polymorphic Forms 54757.rar