Isopropyl methoxypyrazine
Isopropyl methoxypyrazine is a methoxypyrazine, a class of chemical compounds that produce odors. The odor is rather undesirable and is produced by the Asian lady beetle or by the actinomycete Streptomyces sp, and yeast, specifically Saccharomyces cerevisiae. It can be detected by human taste at concentrations of as low as 2 nanograms per litre.
Presence in wine grapes
The odor of IPMP tends to be undesirable in the case of certain wines.Cabernet Sauvignon has high levels of methoxypyrazines. Two methoxypyrazine compounds, 3-isobutyl-2-methoxypyrazine and 3-isopropyl-2-methoxypyrazine, are considered to be important determinants of green flavours in Sauvignon blanc wines.