4-hydroxynonenal 0 156.222 A monounsaturated fatty aldehyde that is nonanal that has undergone dehydrogenation to introduce a double bond at any position in the aliphatic chain and in which a hydrogen at position 4 has been replaced by a hydroxy group. CHEBI:142593 *C([H])=O chebi_ontology 156.11503 C9H16O2 a 4-hydroxynonenal PMID:15865448 chalcogen molecular entity carbon group molecular entity polyatomic entity