label: aldehydic acid
label_lc: aldehydic acid
description: "A monocarboxylic acid derived from any dicarboxylic acid that has a retained name by the formal reduction of one of the carboxy groups to a formyl group. The resulting structure, also known as a semialdehyde, may be named by replacing the ending '...ic acid' of the retained name of the dicarboxylic acid by the ending '...aldehydic acid'. Aldehydic acids therefore contain one carboxy group and one aldehyde group."