This invention relates to L-tartaric acid complexes, acid addition salts, base addition salts of the compound named (S)-4-(((R)-6-(2-chloro-4-fluorophenyl) -5-(methoxycarbonyl)-2-(thiazol-2-yl)-3,6-dihydropyri midin-4-yl) methyl) morpholine-3-carboxylic acid or tautomer thereof and pharmaceutical compositions thereof, and further relates to use of the compounds or the pharmaceutical compositions in the manufacture of a medicament, especially for use in preventing, managing, treating or lessening a HBV infection. The complex, acid addition salt or base addition salt of the present invention is crystalline form, substantially crystalline form, polymorphism, amorphism, hydrate or solvate.
