Ranitidine molecular structure

When the FTIR spectra of polymorph systems differ substantially, the results may readily permit the identification of a particular form. For instance, the two forms of ranitidine hydrochloride yielded spectra that differed in the region above 3000 cm and in the regions spanning 2300-2700 cm and 1570-1620 cm b Zanoterone has been found to crystallize in a number of different forms, each of which yields a characteristic infrared spectrum. When solvent molecules are incorporated in a crystal lattice, the new structure is often sufficiently different from that of the anhydrous phase so that many of the molecular vibrational modes are altered. 

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