label: enynal
label_lc: enynal
description: "An alpha,beta-unsaturated aldehyde of general formula either R(1)C#C-R(2)C=CR(3)-CH=O or R(1)R(2)C=CR(3)-C#C-CH=O, in which the aldehydic C=O function is conjugated to either the C=C double bond or C#C triple bond at the alpha,beta position."