T 1650 (OTTO) 2-Thiophenecarboxaldehyde, 98% Cas 98-03-3 - used in the preparation of beta-aryl-beta-amino acids and urea derivatives. It acts as an arylation reagent. T 1650 (OTTO) 2-Thiophenecarboxaldehyde, 98% Cas 98-03-3- used in the synthesis of unsaturated ketones, which serve as antiviral and cytotoxic agents. In addition to this, it is used as an intermediate to manufacture pharmaceuticals and aromatic compounds.