D,L-N-acetyl-β-2-thienylalanine

(rac)-2-formylamino-3-thiophen-2-yl-propionic acid

(+/-)-2-(chloroacetyl-amino)-3-[2]thienyl-propionic acid

(Z)-2-Acetylamino-3-(2-thienyl)-2-propenoic acid

(5Z)-5-(thiophen-2-ylmethylene)imidazolidine-2,4-dione