Abstract
An understanding of structural features associated with polymorphism in an anti-implantation agent has been made in terms of morphology, single-crystal structure, powder X-ray diffraction, and differential scanning calorimetric measurements. Polymorph 1 (P1) crystallizes from a solution in dichloromethane/hexane in monoclinic, noncentro symmetric $P2_1$ (as plates), whereas the second polymorph (P2) crystallizes from a solution in EtOH/ acetone in tetragonal, centro symmetric $P4_2/n$ (as blocks). P1 is stabilized by $C-H\cdot\cdot\cdotO$ and $C-H\cdot\cdot\cdot \pi$ intermolecular interactions forming molecular chains, while P2 is stabilized by $C-H\cdot\cdot\cdotO$ and $C-H\cdot\cdot\cdot \pi$ dimers and a not so common $F\cdot\cdot\cdot F$ intermolecular interaction.
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