Below is a listing from a bottle of e-liquid that I purchased from Liberty Flights:
Listed ingredients of Liberty Flights - VG | E-LIQUID | Winston | 14mg
vegetable glycerin 75.0%
3-methylcyclopentane-12-dione 2.5%
1-malic acid 3.0%
2,3,5,6-tetramethylpyazine 1.5%
2,3,5-trimthylprazine 0.3%
betadamescenone 0.2%
acetylpyrazine 0.2%
2-acetylpyradine ethanol 10.0%
rhodinol 0.3%
vanillin 2.5%
ethyl acetate 0.5%
ethyl maltol 1.0%
2-mthyl-butyic acid 0.5%