502-21-6 Choline, ester with imidazole-4(or 5)-acrylic acid Choline, hydroxide, imidazole-4-acrylate Ethanaminium, 2-[[3-(1H-imidazol-4-yl)-1-oxo-2-propenyl]oxy]-N,N,N-trimethyl-, hydroxide Murexine hydroxide NSC257903