Monarch Disease Ontology identifier MONDO_0012368 (aminoacylase 1 deficiency) (ACY1D) is an inborn error of metabolism marked by a characteristic pattern of urinary N-acetyl amino acid excretion and neurologic symptoms. Also known as: ACY1D, N-acyl-L-amino acid amidohydrolase deficiency, neurological conditions associated with aminoacylase 1 deficiency.