The molecule is a tricarboxylic acid trianion that is the conjugate base of 5-hydroxypenta-2,4-diene-1,2,5-tricarboxylic acid. It is a conjugate base of a 5-hydroxypenta-2,4-diene-1,2,5-tricarboxylic acid.
(2Z)-2-[(Z)-3-carboxy-3-oxidoprop-2-enylidene]butanedioate