a colourless liquid, C5H4O2, b.p. 162°C, which darkens on standing in air. It is the aldehyde derivative of furan and occurs in various essential oils and in fusel oil.

a colourless liquid, C5H4O2, b.p. 162°C, which darkens on standing in air. It is the aldehyde derivative of furan and occurs in various essential oils and in fusel oil.

a colourless liquid, C5H4O2, b.p. 162°C, which darkens on standing in air. It is the aldehyde derivative of furan and occurs in various essential oils and in fusel oil.