T 1401 (OTTO) 3-Thiophenecarboxaldehyde, 98% Cas 498-62-4 - used in the synthesis of series of 4-substituted 2-thiophenesulfonamides, acetal and ketal derivatives of 4-demethylepipodophyllotoxin-β-D-glucoside and epipodophyllotoxin-β-D-glucoside. Also has been used to produce 1,2-di-3-thienyl-2-hydroxyethanone (3,3?-thenoin), 3-thienyl symmetric analog of benzoin.