Terpin

Terpin

Clinical data
Other names	Dipenteneglycol, p-menthane-1,8-diol
ATC code	None
Identifiers
IUPAC name 4-(2-Hydroxypropan-2-yl)-1-methylcyclohexan-1-ol
CAS Number	565-48-0 Y
PubChem CID	6651
ChemSpider	6399
UNII	MPF495B08R
ChEMBL	ChEMBL1651998
CompTox Dashboard (EPA)	DTXSID7023643
Chemical and physical data
Formula	C10H20O2
Molar mass	172.268 g·mol−1
3D model (JSmol)	Interactive image
SMILES CC1(CCC(CC1)C(C)(C)O)O
InChI InChI=1S/C10H20O2/c1-9(2,11)8-4-6-10(3,12)7-5-8/h8,11-12H,4-7H2,1-3H3 Key:RBNWAMSGVWEHFP-UHFFFAOYSA-N

Terpin is an expectorant, used to loosen mucus in patients with bronchitis and related conditions. It is used as the hydrate (terpin·H₂O). It is derived from sources such as turpentine, oregano, thyme, and eucalyptus. It was used in the United States in the late nineteenth century, but was removed from marketed medications in the 1990s after the Food and Drug Administration (FDA) found a lack of evidence of safety and effectiveness.^[1] Elixirs of terpin hydrate are still available with a prescription, but must be prepared by a compounding pharmacy.

It can be prepared from other volatile oils like geraniol and linalool by adding dilute acids (5% sulfuric acid) to them.^[2]