Form (I) of crystalline (R) or (S) Erdosteine, characterized by the following physical parameters: * diffraction pattern X-ray powder with peaks at 17.0, 20.1, 22.8, 23.4, 27.3, 28.0, 29.1, 30.6, 33.2 ± 0,2grados two-theta; * infrared absorption spectrum with peaks at 1740, 1692, 1683, 1607 and 1576 cm-1; * point 112-134 ° C melting, 123 ° C with start and with a DSC thermogram.
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