4207-40-3 Allantoin N-acetyl-DL-methionine Allantoin acetyl methionine Allantoin, compd. with N-acetyl-DL-methionine EINECS 224-126-2 Methionine, N-acetyl-, compd. with (2,5-dioxo-4-imidazolidinyl)urea(1:1) N-Acetyl-DL-methionine, compound with (2,5-dioxo-4-imidazolidine)urea (1:1)