1 8N8 3,4-bis(bromanyl)thiophene-2-carboxylic acid 1.000 2 C21 Thiophene-2-carboxylic acid 0.800 3 UJM (2s)-thiolane-2-carboxylic acid 0.800 4 UJP (2r)-thiolane-2-carboxylic acid 0.800 5 60P 3-methylthiophene-2-carboxylic acid 0.727 6 9E9 5-chloro thiophene-2-carboxylic acid 0.727 7 LW1 Thiophene-2-carbaldehyde 0.700