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Terpin impurity D EP Reference standard, intended for use in laboratory tests only as specifically prescribed in the European Pharmacopoeia.

ChEBI: Terpin is a p-menthane monoterpenoid.

Crystallise terpin from H2O or EtOH. The anhydrous cis-isomer distils at 258o/760mm but hydrates on exposure to moist air. Anhydrous terpin is also obtained by recrystallisation from absolute EtOH. [Sword J Chem Soc 127 1632 1925, Lombard & Ambrose Bull Soc Chim Fr 230 1961, Beilstein 5 IV 435.]