Propylene Glycol is a propanediol that exists as a clear, colorless and hygroscopic liquid and consists of propane where the hydrogens at positions 1 and 2 are substituted by hydroxyl groups. Propylene glycol is used as an organic solvent and diluent in pharmaceuticals and many other industrial applications. Experimental spectrum in Natural Products Magnetic Resonance Database: [NP0000101](https://np-mrd.org/natural_products/565/submission_spectrum_view?spectrum_id=353&spectrum_type=real)