1 53N 3-[5-(3-nitrophenyl)thiophen-2-yl]propanoic acid 1.000 2 2W9 3-[3-(5-nitrofuran-2-yl)phenyl]propanoic acid 0.810 3 A1CKX (2e)-3-(5-phenylthiophen-2-yl)but-2-enal 0.750